Thule 9907 13-pin to 7-pin adapter NEW IN STOCK 7313020050270 | eBay
13 pin 13P to 7 pin 7P adapter plug for trailers and caravans - Cablematic
Trailer Socket Adapter, Black Heat Resistant Tow Bar Plug Adaptor Universal Safe 7 Pin To 13 Pin And 13 Pin To 7 Pin For All EU Trailer Plugs - Walmart.com