Oblong clearance or side marker light with a reflectorized lens， eliminating the need for a separate reflector to meet DOT requirements. Single wire design grounds through mounting screw (except MC31AB2， MC31RB2， MC31A15B2 and MC31R15B2 two-wire versions). All-weather molded plastic housing and durable lens protect against corrosion. Features snap-on， replaceable lens and easy to change replaceable bulb. Mounts on industry standard 3" centers.