Hey all, my first post here so be gentle. Lol

As the subject states I've got a 00 Celica GTS. The stock head unit is messed up and the volume knob no longer works so I'm wanting to swap it out with a newer head unit. I bought the pigtail that the specs on amazon said should fit my car, waited a couple days for it to get to me only to find out its the wrong one. Headed to the local Walmart, bought the one they sold there only to find that the "'84 and up" Toyota pigtail they sold me was the wrong size as well. Same problem at all the local auto parts stores, too... All the pigtails I could find had too few contacts and the size of the female plastic piece that the factory wiring is supposed to fit in is too small to fit. So, my question is where in the world do I get the proper pigtail for this car so I can put a decent head unit in my car?

Any help will be greatly appreciated. Thanks