CURT 56072 - 7' WIRING EXT HARN.19-26 GM 1500/ 20-26 HD7' WIRING EXT HARNESS ; 19 26 SILVERADO SIERRA 1500 20 26 SILVERADO SIERRA HD 7' GM Wiring Extension Harness & Cover (Adds 7 Way RV Blade to Truck Bed) Routes a 7 way RV blade socket into truck bed while retaining use of rear socket Simple plug and play design eliminates the need for cutting or splicing Cover adapts 7 way socket to fit factory GM truck bed connector opening Allows for easy connection of 5th wheel or gooseneck wiring 7 way connects