Amazon.com: CARROFIX Trailer 4 Wire Plug 32" inch 4 Pin Flat Wire Extension Male & Female Connector : Automotive
Amazon.com: Oyviny 4-Way Flat to 7-Way Round Blade and 4 Way Trailer Wiring Harness Adapter Vehicle-Side 4 Pin to Trailer-Side 7 Pin and 4 Pin Dual-Output Connector with Mounting Bracket for Truck