Good info. People fret too much over factory belts. Long ago, I downloaded a belt catalog (Gates, Goodyear, forget). For V-belts, there are 3 basic widths and lengths in 2" increments, captured in the PN. Measuring the length you need is the trickiest part. Try marking on a stiff 1/4" poly rope. Once you get the PN, go to ebay and Amazon and also look at "alternate PN". Some belts are fancier, like Goodyear's Gatorback, some with angled teeth to run smoother and/or quieter. Carry your old belt in the trunk for emergencies.