I chatted with Tracker Sales online last week to ask the same question. I was told that it is a 7 pin SAE standard connector. The overall connector is round and the pins are flat. I'm not sure which you were asking about. I ordered mine with trailer brakes so I wanted to know exactly what the connector was so that I'm set to go. I went into Bass Pro and looked at a 170 with the trailer brakes also. They are drum brakes with a surge type actuator so the connector, a round 7 flat pin SAE, is only wired to 4 of the pins. There's not even a 5th pin needed for the brake lockout on the drum brakes so all you need to do is cut off your 4 pin and buy a 7 or even a 7/5/4 multi connector for the vehicle side and then attach your wires to the correct terminals. You can always add a brake controller later for some other trailer but you won't need it for this even if it has brakes.
This is what I'm getting for mine... Etrailer * Item # HM48470