This 7- and 4-pole trailer connector eliminates the need for an adapter and allows you to tow a trailer with either a 7- or 4-pole plug. Socket connects to your vehicle's OEM wiring system ... on Chevrolet, Ford, GMC and Nissan trucks and SUVs Can be used to add a connector to 2003 and newer GM pickups and SUVs Bracket dimensions: 4-3/4" long x 3-1/16" tall x 1-3/4" deep Distance