In order to get the right serpentine belt for my 2000 Silverado 5.3 Z71 I need to know which alternator I have (100 amp, 105 amp, or 130 amp), how can I find this info? The alternator doesn't have any markings visible while installed. The original belt is a GM 12554029 URN 6PK2345. I'm trying to find the belt on rockauto.com but that number isn't on any of their selections.
Thanks for any help, Al