Build Your Dream Custom Seat with Professional-Grade Mounting Hardware
Transform your bobber or chopper build with TC Bros' precision-engineered Weld On Solo Seat Spring Mounts. These CNC-machined mounts deliver the rock-solid foundation your custom seat deserves, combining old-school craftsmanship with modern manufacturing precision.
Why Riders Choose These Mounts
Imagine the satisfaction of a perfectly mounted solo seat that moves with you on every ride—no rattles, no flex, just smooth suspension action from your torsion springs. These aren't stamped sheet metal brackets that'll fail after a season. They're machined from solid 1018 cold rolled steel, built to handle years of hard riding.
Key Features
CNC Machined Precision: Crafted from 1018 cold rolled steel for superior strength and durability
Universal Fit Design: 1 1/8" radius cope fits both 1" and 1 1/4" cross tubes seamlessly
Stainless Hardware: 5/16"-18 stainless steel studs resist corrosion and maintain clamping force
Torsion Spring Compatible: Engineered specifically for torsion-style seat springs
Weld-Ready Finish: Clean steel surface ready for your torch—no prep work needed
Complete Kit: Includes 2 mounts, 2 stainless washers, 2 studs, and 2 nylock nuts
Technical Specifications
Material: 1018 Cold Rolled Steel
Stud Thread: 5/16"-18
Base Diameter: 1"
Cope Radius: 1 1/8"
Tube Compatibility: 1" and 1 1/4" cross tubes
Finish: Raw steel (weld-ready)
Country of Origin: USA
What's in the Box
2 × CNC Machined Steel Mounts
2 × Stainless Steel Studs
2 × Stainless Steel Washers
2 × Nylock Nuts
Note: Seat springs sold separately
Installation Made Simple
The pre-coped radius means these mounts sit flush against your frame tube right out of the box. Position them where you want your seat, tack them in place, check your alignment, then lay down a solid bead. The universal design gives you complete freedom to position your seat exactly where it feels right for your build.
Built by Builders, for Builders
TC Bros understands what custom motorcycle fabricators need because they're fabricators themselves. These mounts represent the same quality and attention to detail you'll find throughout their entire line of chopper and bobber components.
Ready to mount your custom seat the right way? Add these professional-grade spring mounts to your cart and take the next step in your build.
TC Bros. Weld-On Front Solo Seat Pivot / Hinge for Bobbers & Choppers
Regular price
$87.95
TC Bros. Weld-On Front Solo Seat Pivot / Hinge for Bobbers & Choppers
This pivot bracket is made from one piece of 3/16" steel for the ultimate in strength and simplicity. Unlike welded pivot brackets, the one piece design eliminates the possibility of a cracked seat pivot bracket caused by a failed weld. It also makes for a very low profile that looks great on just about every aftermarket spring style solo seat made. The long slotted holes permit a wide range of fitments and allow for adjustability. The finish on the bracket is black powdercoat for durability. This simple design also permits the weld-on mount to be mounted to either a round frame tube or a flat surface without a standoff and without interference to the pivoting action because the weld-on pivot mount is slightly larger in diameter than the rest of the components. The weld-on pivot mount is raw finish steel and ready to weld. The 3/8" hex socket cap bolt is stainless steel, as well as the washer and nylock nut so they will never rust. The replaceable bushings are oil impregnated bronze for a squeak free ride and very long life. Fitment possibilities are nearly endless. If you have a solo seat with springs on it, this bracket will probably fit.
Made in USA.
TC Bros 5 inch Round Chopper Oil Tank Flat Ends Universal Fit
Regular price
$312.95
TC Bros 5 inch Round Chopper Oil Tank Flat Ends
TC Bros. 5" Round Oil Tank With Flat Ends Universal Fit.
100% TIG welded from heavy duty mild steel. Pressure tested to ensure quality, leak free performance. Includes CNC machined, knurled aluminum cap (thread size 1-5/16-12tpi). CNC machined bungs are 1/4" NPT for easy plumbing of oil lines.
Dimensions: 10"L x 5"OD. 3 quart oil capacity.
Proudly Made in the USA.
See TC Bros. Part #105-0133 for rubber isolated mounting hardware kit.
TC Bros Electronics Tank (Fake Oil Tank)
Regular price
$146.95
Electronics Tank (Fake Oil Tank)
TC Bros. Custom Chopper/Bobber Electronics Tank that looks like a round oil tank.
The electronics tank is 4.5" diameter and has removable caps (8" long with both end caps installed) for hiding all of your wiring and ignition components while still having access to them. 5/16-18 Mounts are already welded in for you (3.5" center to center spacing) and mounting bolts are included. Parts are made from 16ga steel and are raw finish. The mounting strap is included for you to bolt or weld on. Can fit many other models and applications. The picture shows items mounted on a hardtailed XS650 (bike not included).
Electronics Tank(fake oil tank) dimensions: 4 1/2" diameter and 8" long with caps installed.
Build your custom bobber or chopper with confidence using this heavy-duty spun steel rear fender. Engineered for durability and designed for classic styling, this fender delivers professional quality for your custom build.
Key Features
Premium 13GA (.090") spun steel construction - Exceptionally thick and durable, built to last a lifetime
6.25" inside width - Accommodates up to 140 series tires with proper clearance
27.5" inside diameter - Perfect fit for 16" wheels and tires
Parallel sidewalls - Simplifies mounting to sissy bars or fender struts
Professional spun finish - Among the highest quality fenders available anywhere
Tire Compatibility
This fender works perfectly with vintage and modern 16" tire sizes including:
Why Choose Spun Steel? Spun fenders are formed from a single piece of steel, eliminating weak points and welds. The result is a stronger, more durable fender with a smoother finish that's ready for paint or powder coating.
TC Bros. Weld On Kick Stand for 1-1/4" Frame Tubing
Regular price
$156.95
Weld-On Kick Stand for 1-1/4" Frame Tubing - Black
Get rid of your ugly stock kickstand and replace it with TC Bros. super clean black kickstand with hidden spring.
Kit includes satin black powder-coated kickstand and weldable steel block coped to fit 1-1/4" tubing on your frame.
*not for use on kick-start models
Prism Supply Co Weld-On Flat Tail Light
Regular price
Sale price
$185.00
Weld-On Flat Tail Light
These tail lights are perfect for that weld-on application. Works great welded to a sissy bar moulded to a frame or welded to a license bracket.
These dual-function 1.25" LED's act as a brake light and running light. The size of the housing is 1.5" diameter x 4/5" long.
Complete TC Bros Sissy Bar Kits for Custom Motorcycles
TC Bros sissy bar kits provide everything you need for a professional sissy bar installation on your custom motorcycle. Available in four distinct styles to match your build aesthetic and rider preferences, these complete kits include the sissy bar, mounting tabs, and all necessary hardware for installation.
Available Styles:
Short - Straight - Compact height with straight vertical design for minimalist bobber builds
Short - Kickback - Compact height with angled kickback for improved passenger comfort
Tall - Straight - Extended height with straight vertical design for maximum support
Tall - Kickback - Extended height with angled kickback for ultimate passenger comfort and support
Key Features:
Complete Kit - Includes sissy bar, mounting tabs, and all hardware
Multiple Styles - Four configurations to match your build and riding needs
Quality Construction - Durable steel construction built to last
Professional Quality - Manufactured to TC Bros' exacting standards
Ready to Install - Everything needed for installation included
Versatile Mounting - Works with a variety of custom frames
Choosing the Right Style:
Short vs. Tall:
Short: Lower profile sissy bars are perfect for solo riders or minimalist bobber builds. Provides back support without dominating the bike's profile. Ideal for traditional bobbers and choppers with a clean, stripped-down aesthetic.
Tall: Extended height sissy bars offer maximum passenger support and comfort for two-up riding. Perfect for touring-oriented customs or bikes that regularly carry a passenger. The taller design also provides more mounting options for luggage.
Straight vs. Kickback:
Straight: Vertical design maintains a clean, traditional appearance. Works well for solo riders or when you want a more upright, classic look.
Kickback: Angled design leans back toward the passenger for improved comfort on longer rides. The kickback angle provides better lumbar support and a more relaxed seating position.
Premium Upgrade Option:
While these kits include standard mounting tabs, consider upgrading to our TC Bros sissy bar/fender strut mounting bungs for a stronger, more stylish installation. These precision-machined bungs offer superior strength compared to standard tabs and add a professional, finished look to your build. Available in 1/2" and 5/8" internal diameters, they're the preferred choice of professional builders for high-end custom motorcycles.
Specifications:
Material: Steel
Styles: Short/Tall, Straight/Kickback
Includes mounting tabs and all hardware
Professional quality construction
Perfect For:
Custom motorcycle builds
Bobber and chopper conversions
Hardtail frames
Rigid frame builds
Two-up riding setups
Luggage mounting applications
Installation Notes:
These sissy bar kits are designed for custom motorcycle frames with appropriate mounting points. Professional installation is recommended if you're not experienced with frame modifications. Installation recommendations:
Verify frame has appropriate mounting points or can accommodate welded tabs
Ensure proper clearance for rider and passenger
Use appropriate welding techniques if welding tabs to frame
Torque all hardware to manufacturer specifications
Test stability and security before riding
Consider upgrading to precision-machined mounting bungs for superior strength
Each TC Bros sissy bar kit is manufactured to exacting standards and includes everything needed for a professional installation on your custom motorcycle build.
The Prism Supply Co. PS-41 Tail Light is a precision-crafted, modern LED interpretation of the iconic RH-55 Guide Light that originally graced Panheads and Ironheads. At 30% smaller than the original, it delivers that unmistakable vintage silhouette in a compact, waterproof package — built to last and designed to turn heads.
What's Included
Aluminum housing — available in Brushed or Polished finish
Injection-molded Prism Supply lens
Dual-brightness 1.85" diameter waterproof LED (running & brake)
Stainless steel mounting hardware
Specifications
Overall dimensions: 3.375" x 2.5" x 1" thick
30% smaller than the original RH-55 Guide Light
Waterproof LED — suitable for all weather riding
Compatibility
Designed to complement classic Harley-Davidson Panhead and Ironhead builds. A natural fit for custom choppers and bobbers seeking a period-correct tail light with modern reliability.
Motogadget mo.blaze tens3
Regular price
$179.95
mo.blaze tens3
The mo.blaze tens3 from motogadget is the smallest 3in1 indicator in the world.It is a turn signal, taillight and brake light in one light element at the same time.
Its tiny dimensions and the reduced design make it almost disappear on the vehicle.As soon as it lights up, thanks to the IntensiLED® Technology, it is extremely bright and definitely cannot be overlooked.
At the same time, the additional side beam angle ensures the best visibility and safety.
The add-on indicator has ECE approval as a rear direction indicator/taillight / brake light.The aluminum housing is CNC milled and available in black anodized or high-gloss polished versions.
The flasher can be operated like any common LED flasher with load resistors or our load-independent flasher relays (mo.flash, mo.wave, mo.stop, mo.relay +).To match the mo.blaze tens3, we offer the mo.blaze tens4 as an indicator with a position light for the front.
benefits
extremely small aluminum housing
ECE approval, no registration or similar necessary
increased visibility and safety thanks to an additional side beam angle
maximum luminosity thanks to the latest high-performance LED technology (IntensiLED®)
Electronic voltage conditioning through 330kHz clocked, IC-controlled constant current source and safe protection electronics
the fastening thread is standard M8.Therefore no mounting adapter or special heat sink nuts are necessary
scope of delivery
Single 3in1 mo.blaze tens3 turn signal with M8 thread
Nut M8
4 push-lock cable connectors
installation Guide
Please order two 3in1 indicators for use as a rear pair.
Specifications and features
Total length with thread
29 mm
Length without attachment thread
11 mm
Largest diameter
11 mm
Cable length
approx. 110 cm
Weight with cable
approx. 20 g
Attachment
M8 threaded bolt
Power consumption
approx. 1/2/3 watt
Motogadget mo.blaze tens2
Regular price
$99.95
mo.blaze tens2
The mo.blaze tens2 from motogadget is the smallest rear light/brake light combination in the world.
Its tiny dimensions and the reduced design make it almost disappear on the vehicle.As soon as it lights up, thanks to the IntensiLED® technology, it is extremely bright and definitely cannot be overlooked.
At the same time, the additional side beam angle ensures the best visibility and safety.
The taillight/brake light combination has ECE approval as a rear taillight and brake light.The aluminum housing is CNC milled and available in black anodized or high-gloss polished versions.
The rear light/brake light combination can be operated with 12 V like any conventional LED light.
benefits
extremely small aluminum housing
ECE approval, no registration or similar necessary
increased visibility and safety thanks to an additional side beam angle
maximum luminosity thanks to the latest high-performance LED technology (IntensiLED®)
Electronic voltage conditioning through 330kHz, IC controlled constant current source and safe protection electronics
the fastening thread is standard M8.Therefore no mounting adapter or special heat sink nuts are necessary
scope of delivery
Single rear light/brake light combination mo.blaze tens2 with M8 thread
Nut M8
3 push-lock cable connectors
installation Guide
For use as a pair (only for the rear) please order two mo.blaze tens2.
Specifications and features
Total length with thread
29 mm
Length without attachment thread
11 mm
Largest diameter
11 mm
Cable length
approx. 110 cm
Weight with cable
approx. 20 g
Attachment
M8 threaded bolt
Power consumption
approx. 1/1 watt
Motogadget mst streamline cup
Regular price
$170.00
mst Streamline Cup
The mst Streamline Cup is used for mounting all tiny series analogue speedometers on the handlebar. The intended use of these stylish brackets is the mounting of all 49 mm instruments of the tiny series to handlebars with a diameter of 22 mm and/or 1 in. The cups are completely turned and machined from solid aluminum. The mounting clamp is precisely laser-cut from aluminum and shaped and is used for an easy but secure mounting on the handlebar.
All mounting screws are stainless steel. Diameter 56 mm, Length 60 mm
Motogadget msp Breakout Box B
Regular price
$164.95
msp Breakout Box B
All motoscope pro indicator lights, temperature, and oil pressure signal cables are connected to the msp Breakout Box B.
Convenient screw-type terminals make child's play of the interconnections. Between the box and the motoscope pro just one cable is required (mo.bus). The msp Breakout Box is moulded-in waterproof and vibration-resistant.
The msp Breakout Box B is compatible with the last generation motoscope pro only. It is incompatible with the older first generation of the device (identified by the missing bar-code decal at backside).
Specifications and features
Dimensions (LxBxH)
26 x 39 x 10 mm
Input terminals
Fuel/reserve Oil pressure switch Left and right turn indicators High beam Neutral Motor warning light Oil temperature Water temperature Ambient temperature Oil pressure
XS650 Billet Aluminum Intake Manifolds allow fitment of aftermarket 34-36mm Mikuni VM Roundslide carburetors to 1970-1984 Yamaha XS650 and TX650 models.
Get rid of your cracked and leaking rubber intake manifolds and replace them with our super trick CNC machined billet aluminum racing intakes. These are very sturdy and improve flow to your motor. They are perfect when installing aftermarket carbs. Your stock rubber intakes are not designed to support the weight your carbs without your stock airboxes installed, causing them to crack over time. Our aluminum intakes are much stronger and will not crack.
Kit includes stainless steel hoseclamps that will never rust.
These will fit aftermarket 34-36mm Mikuni VM Roundslide Carbs ONLY. Will not fit stock 34mm CV or BS, stock 38mm, or Mikuni 38mm VM Roundslide Carbs.
Sold as a pair.
Made In USA.
TC Bros - Universal Linkage Kit
Regular price
$97.95
Universal Linkage Kit
Universal Linkage Kit for all TC Bros. metric forward control and rearset kits. The rods/tubes will need to be cut to fit your application.
Kit Includes:
Two 24'' Long 5/16" Threaded Rods
Four 5/16" Ball Joints
Two 5/16" ID x 1/2" OD Steel Tubes* (to cover rod threads and increase rigidity)
Eight 5/16" Jam Nuts
Four Nylock Nuts
Four Flat Washers
TC Bros - Cobra Seat
Regular price
$536.95
Hardtail Rigid Cobra Seat
TC Bros. Cobra hardtail chopper seats feature quality American construction and timeless looks. Handmade in the USA, these seats are designed to be a perfect fit to the TC Bros. 1982-03 Sportster weld-on hardtails using their mounting kit and fender.
Five 5/16-18 threaded mounts on the heavy 14ga powder coated steel seat pan make it possible to fit these seats to many other hardtail frames as well. Hand stitched from 100% Marine grade vinyl, these seats look like leather but without the maintenance.
Bolt-on some serious style to your bike with this seat!
Available in diamond or pleaded.
PLEASE CONTACT US FOR AVAILABILITY IF INTERESTED IN PURCHASING THIS ITEM. INFO@PERTHCOUNTYMOTO.COM
Add timeless style and comfort to your hardtail chopper with this handcrafted King & Queen seat. Built with American quality and designed specifically for TC Bros Sportster hardtail conversions, this seat delivers classic chopper aesthetics with modern durability.
Compatibility: Designed for TC Bros Sportster hardtail kits with matching mounting kit, fender, and sissy bar
Universal mounting: Six 5/16-18 threaded mounts fit many other hardtail frames
Weight: 10 lbs
Key Features
Handmade in USA - American craftsmanship and quality control
100% Marine-grade vinyl upholstery - Looks like leather without the maintenance, resists weather and UV damage
Hand-stitched construction - Premium detailing for lasting durability
Heavy 14GA powder-coated steel seat pan - Robust foundation that won't flex or crack
Six 5/16-18 threaded mounting points - Secure installation with universal compatibility
Choice of patterns - Available in diamond or pleated stitching
Classic King & Queen profile - Iconic chopper styling with passenger comfort
Pattern Options
Choose from two classic stitching patterns to match your build aesthetic:
Diamond pattern - Traditional diamond-stitched design for vintage appeal
Pleated pattern - Clean, linear pleats for a streamlined look
Why Choose Marine-Grade Vinyl?
Marine-grade vinyl delivers the rich look of leather with superior weather resistance and virtually no maintenance. It won't crack, fade, or require conditioning like leather, making it the perfect choice for choppers that see real road miles.
Complete Mounting System
This seat is engineered to work perfectly with TC Bros Sportster hardtail components (sold separately):
The six 5/16-18 threaded mounts also allow fitment to many other hardtail frames with proper mounting hardware.
Specifications
Seat pan material: 14GA powder-coated steel
Upholstery: 100% Marine-grade vinyl
Construction: Hand-stitched
Mounting points: Six 5/16-18 threaded inserts
Patterns available: Diamond or pleated
Country of origin: USA
Complete Your Sportster Hardtail Build
Pair this King & Queen seat with TC Bros hardtail kits, fenders, sissy bars, and oil tanks to create the ultimate custom Sportster chopper.
Motogadget MSM Combi Frame with Indicator Lights
Regular price
$199.95
MSM Combi Frame with Indicator Lights
The msm combi frame allows installation of motoscope mini to the handle bar with additional mounting hardware. 5 indicator lights and series resistors are pre-installed. The device is machined from solid aluminum and available in an anodized or polished finish.
The combi frame comes with approx. 50 cm cable, screws, and manual. Additional mounting parts like the combi Clip-Kit Bracket, combi Bolt-On Bracket, combi Weld-In Bracket or combi Mounting Bracket are required. The motoscope mini itself is not included.
Please note the two orange LEDs are replaced with green ones according to EU regulations since 2011.
