Optronics - Rectangular Reflector Marker/Clearance Light, Red, Pollack. Rectangular clearance or side marker light with reflectorized lens, eliminating the need for a separate reflector to meet DOT requirements. Features Snap-On, replaceable lens and easy to change replaceable bulb. All-weather molded plastic housing and durable lens protect against corrosion. Mounts on industry standard 3 inch centers. Assembly contains both lead and ground wire for mounting to all surfaces. Dimensions: 4 inch L x 1-1/2 inch H x 15/16 inch D.