I went to buy a serpentine belt for a 92`lincon town car w/4.6, at an autoparts store and I was asked if it was a five or six grooved belt. I told them it was a six groove. They didn't have it. So I went to another store and was asked if it was factory air or dealer installed air. I do not know, but both of the belts I looked at were six groove, the differance was about three inches. I took both home. I removed the old one and matched it up. It was the shorter of the two. But when I installed it, it seemed very tight. I had to push the ider pully until it wouldn't go any further. When released the pully it moved only two inches. I think it's too tight. How do I find out what belt should be in it? I have been to a couple of ford sites and was not given a choice of belts. I hate buying stuff from the dealer but the auto stores are full of clueless employees. So any ideas?