Trailer Hitch Adapter M10x1.0 - The Robert Axle Project
Trailer Wiring Adapter - 4 Way Flat to 7 Way Round | Meijer
Seven-Way Blade to 4-Way Flat Trailer Adapter
12 Pin Military Vehicle to 7 Blade Civilian Trailer Adapter – Federal Military Parts (763) 310-9340
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