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
Amazon.com: Trailer Adapter plug, convert 4 way flat to 7 way RV trailer (97015), Model: , Home & Garden Store : Automotive
Amazon.com: YONHAN 4 Pin to 7 Pin Adapter Trailer Light Adapter 4-Way Flat Truck to 7-Way Blade Reverse Plug Connector with Mounting Bracket for Towing Solutions : Automotive
Reese Adapter 7 Way Round to 4 Way Flat in the Trailer Parts & Accessories department at Lowes.com
Trailer Wiring Adapter - 4 Way Flat to 7 Way Round | Meijer