CURT 56364 - WIRE HARNESS 17-20 ENVISIONCURT 4 FLAT CUSTOM WIRING ; 17 20 BUICK ENVISION Plugs into existing OEM vehicle socket to provide a 4 way flat socket Simple plug and play design eliminates the need for cutting or splicing 4 way flat output connects tail lights, brake lights and turn signals Dust cover included to keep connector clean when not in use Backed by a limited one year warranty Installation Difficulty: Novice Installation Time (Minutes): 10