Unique all-in-one corrosion free design. Incandescent versions utilize S-8 wedge-style lamps maintaining high reliability in demanding environments. Includes gasket. Type 3157 bulbs are used for stop/turn/running lights, type 3156 bulbs are used for backup lights. Each draws 2.1 amps. Also available in a surface mount LED version giving the great looks of a built in tail light without cutting holes. You can easily replace your incandescent 003-20 lights with 003-20L LED units.