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
TowSmart 7-Way Blade to 4-Way Flat Trailer Light Wiring Adapter 1415 - The Home Depot
CURT Electrical Adapter (4-Way Flat Vehicle to 7-Way RV Blade Trailer) 57184 - The Home Depot
Dual Output Vehicle Side 7 Pin 4 Pin Trailer Wiring Plug Set with Mounting Bracket Waterproof - Walmart.com
Amazon.com: Reese (118710) 7-Way European Style Round Pin to 4-Way Flat Adapter : 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
Trailer Wiring Adapter - 4 Way Flat to 7 Way Round | Meijer