Not sure about auto zone...never bought anything from them. I just removed the covers from the belts and got in there. you have more room to work with in a 4 than a 6 cyl. One belt cost me like 18 bucks, and another one was 21ish. I can get the name of the place from my mechanic, since he ordered it. He orders from reputable shops with high quality parts. The timing belt is a whole other can of worms. It takes a good shop a few hours to replace one. Not something Id try on my own.
Is it English? Does it moo?