The Blazer B430BLK 4” round stop/tail/turn light is designed to conform to applicable U.S. FMVSS108 and Canadian CMVSS safety standards. The light is surrounded by a replaceable acrylic lens and steel housing and includes a double lead wire. The recessed light and requires a 4.5" diameter cut out for installation. Replace bulb with any standard #2057 incandescent.