When replacing your factory radio with an after-market car stereo the GWH-342 wire harness is a must for a quick and clean installation. It eliminates cutting your OE radio plug. After connecting it your install is simple as the wires will color-match and easily connect to the after-market stereo. Car Harness for select 1973-1993 GM/Chevrolet Vehicles. Plugs into car harness. One 12-pin plug and one 2-pin plug. Original high quality factory plug. High impact ABS OEM plastic molded connectors provide a perfect fit. OEM Quality terminals.