alty (due to failure) to a 90 amp new aftermarket model and that came with a smaller pulley wheel than stock (so it turns faster). Used NAPA belt #25-030350 - 35 inch belt. This one is smaller than what I had on there -- pretty sure by 1.5 inches. Just check the NAPA belts, it's the next one larger than the number I posted...
Even with this one -- still took a few tries to get it tight enough after letting is settle for a few days to stretch...