The square trailer light kit is designed is designed to conform to applicable U.S. FMVSS108 and Canadian CMVSS safety standards and meet DOT requirements for trailers under 80" wide. Ideal for use on utility, camping, snowmobile, and motorcycle trailers. The stop/tail/turn lights are replaceable with model numbers B83 and B93. The bulbs are replaceable with the standard #1157 auto bulb. Side marker bulbs are also replaceable with standard #168 auto bulb. The kit includes 2 stop/tail/turn lights, 2 side markers, 20 ft. wire harness with 4-way flat connector, rustproof license plate bracket, mounting hardware and trilingual instructions- everything needed for easy installation and DOT compliance.