Welcome back! I have a couple of options for a wiring harness but it depends on what model your 2010 Subaru Impreza is. From what I can tell the Outback Sport model is a hatchback so if that's the case you'll need the 5-Door Wagon option but wanted to list both.
Sedan - Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 56061
5-Door Wagon - Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # C56111 view full answer...
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