I recently installed a j&S 240 amp high output alternator. I'm having one hell of a time trying to find the right serpentine belt. The website says to get a serpentine belt that is a half an inch shorter. I've tried this route going through NAPA Auto parts and I have been unsuccessful. I went and installed a brand new OEM belt hoping that it would work, but it's not. It squeaks and squawks and there's voltage drop. If anybody has links or the exact belt that I need for an aftermarket high output alternator I would greatly appreciate it.