Amazon.com: CARROFIX American RV Style 7-Way Connector to European 13-Pin Plug - US Vehicle 7-Way Blade to EU 13-Pin Round Trailer Light Converter : Automotive
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Carevas Tirol 7 To 13 Pin Trailer with Cable Adapter Wiring Connector Towbar Plug & Socket - Walmart.com
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ISO standards for trailer connectors - Wikipedia
Selecting and using the right socket - 7-pin or 13-pin plug?
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Caravan and Trailer Connector Guide | 12N, 12S and 13-Pin