I am needing to get a new Belt for my 94 Z28. The parts store (O'Reillys) says there are 2 part #'s. One belt is slightly longer than the other. How would I find out which one I need exactly? Anyone else run into this problem? Any help would be greatly appreciated!!
Brad

 

According to Napa's website, there is a slight difference between M6 and A4 cars. To be honest, this is the first I have seen this.

Edit: I tried to post a link but it wouldn't work. I did find it on www.napaonline.com though.