I'm having problems keeping my A/C belt on. I'm running a NAPA 25-040370 which is a Gates K040370 that is 37.559". Looking on their website there's tons of different lengths. Not sure which one I need. Anyone know? I'm pretty sure the one I have now is too long!

 

Well I got a 25-040360 which is about a little more then 3/4". It's on there but a little snug. I guess I'm going to try it cause I don't feel like driving back to NAPA. 25-040365 is probably perfect unless this one stretches then it will be fine!