MECMO Multi-Tow 4-Way Flat to 7-Way RV Blade and 4-Way Flat Female Trailer Wiring Adapter Connector Kit, Adapt 4-Way Flat Vehicle-Side Socket to Multiple Trailer Plugs with Mounting Bracket - Walmart.com
Trailer Connector/Adapter Harness 13 pin to 7 pin US — G-wagenaccessories.com
MaxxHaul 70086 7-way Round To 4-way Flat Trailer Plug Adaptor with 18-in Flexible Cable Which Extends To 36-in in the Trailer Parts & Accessories department at Lowes.com