Universal 2 on center stud mounting. Screw-on main and side marker lens allow for easy bulb replacement. This tail light is designed for a variety of under 80 light-duty trailers. Wiring uses the quick connect and disconnect feature. These tail lights meet FMVSS/CMVSS 108 requirements. 4-3/4 x 4- 1/2 x 2-9/16