Biltwell Inc. Polished Model B Taillight TL-HIV-AL-PS CNC lathe-turned 6061 T-6 aluminum light housing in either polished or black finishes Extra thick injection-molded polycarbonate plastic lens Custom 15-element LED board with two phases (brake light and running light) and three wires (ground, brake and running lights) Two 1/4-20 button head Allen bolts for mounting on Biltwell brackets (see below and in GENERAL section), custom fender bracket or Model-B style taillight/license plate brackets Outside diameter of housing is just over 2-5/8in. and the red taillight lens is 1-5/8in.