Amazon.com: WESTFALIA Automotive Adaptor 7-pin to 13-pin to Connect 7pin Socket on The Vehicle to 13pin Socket on The Trailer or Bike Carrier : Automotive
7 To 13 Pin Adapter Trailer Socket Connector 12v Caravan Truck Towbar Towing Electrical Converter N Type Plastic - Cables, Adapters & Sockets - AliExpress