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
Amazon.com: Rain King 4 Pin to 7 Pin Trailer Light Adapter Reverse Plug Electrical Connector with Mounting Bracket for Car Truck Rv Trailer Light Plug Wire Harness Converter Adapter : Automotive