Amazon.com: OPT7 7 Pin to 4 Pin Trailer Adapter with Secure Tab, 7 Way Blade to 4 Way Flat Trailer Light Adapter, Connector for Trailer Tow Hitch and Redline LED Tailgate Light Bar : Automotive
Trailer Light Electrical Adapter | StowAway
7 Pin RV Trailer Light Connector Adapter Plug Trailer Wiring Adapter with US Plug Black - Walmart.com