Trailer Wiring Adapter - 4 Way Flat to 7 Way Round | Meijer
Amazon.com: Trailer Adapter plug, convert 4 way flat to 7 way RV trailer (97015), Model: , Home & Garden Store : Automotive
Amazon.com: Trailer Plug Adapter 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 for Trailer Tow