Oyviny 4-Way Flat to 7-Way Round Blade and 4 Way Trailer Wiring Harness Adapter Vehicle-Side 4 Pin to Trailer-Side 7 Pin and 4 Pin Dual-Output Connector with Mounting Bracket for Truck RV(Black) :
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Reese (118710) 7-Way European Style Round Pin to 4-Way Flat Adapter : Amazon.com.au: Automotive
YONHAN 4-Way Flat Truck to 7-Way Blade Trailer Light Adapter Reverse Plug Connector with Mounting Bracket for Towing Solutions : Amazon.com.au: Automotive