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
Seven-Way Blade to 4-Way Flat Trailer Adapter
Europe To US Trailer Light Converter for European 7 pin to American 4 pin Adapter Wiring Connector Trailer Plug Accessories - AliExpress