Buy Reese Towpower 7-Blade to 6-Round and 4-Flat Plug-In Adapter
Amazon.com: Adapter 7-Way Blade to 6-Way Pin, RV 7 to 6 Trailer Wire Kit, 7-Wire to 6-Wire Coiled Cable with Female Receptor Trailer Adapter Stretches to 10 ft : Automotive
Amazon.com: CXTM 7 RV Blade to 6 Pole Round, 6 Way to 7 Way Adapter 7-Way Blade to 6-Way Round Trailer Adapter 7 pin to 6 pin Trailer Wiring Plug Adapter : Automotive