Gwen is most likely correct. I was thinking maybe ice maker harness, but couldn't get enough detail in that picture. FWIW, vans with factory AC have a 6 position harness plug (with 5 positions filled) that's taped off to the resistor harness (on the vans without ice makers). Now that I think about it, I think they usually use yellow tape.

Regardless or what that connector is for it sounds like you got it figured out. I'm interested to find out what RockAuto sends you. They sent me the wrong one when I ordered through them. Please report back with brand, part number, price, and if it actually works. Tim