Ripple Tail Light (Weld-On)
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" LEDs act as a brake light and running light. The size of the housing is 1 7/8"  diameter x 1" long.
Stainless or mild steel options are available. 
Will come with flat and dome lens.