As an ever-faithful reader of the blog, I’m sure you remember this article about checking and replacing your belt before terrible things happen. One quick tip during a service like this is to make sure the new belt is the same length as the old one. Most of the time belts stretch with age, so a little difference is fine, but you definitely want to make sure you have the right belt before you go to all the trouble attempting to install the wrong part! I’ve worked on both sides of the parts counter long enough to know that parts can be listed in the catalog wrong, boxed wrong, or you could just have a mildly dyslexic parts picker. I’ve done that more times than I care to admit.
Moral of the story: always check parts for proper fit before installation if possible. It can really save some headaches later on.