Rick, I just changed all my belts yesterday, I bought them last Sept. and had planned to change them at Lukes BBQ but that's another story
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First on my 1980 I needed a 15mm wrench for all the bolts and a 16mm for the top bolt on the Air compressor. So here 8 months later the alt belt was at least an inch short. That belt was in need of repair as it was shreading. Of course the PS, AP, and Comp belts have to come off first
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Alt belt went on perfect, compressor belt....short
but old one was in good shape. PS and AP no problem.
GM said they had two style pulleys and up pulley and a down pulley so two different sizes.
I would see if you can read the number on the original belt, have them cross reference it and also have them tell you the lenght, then match it.
ebo
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ebo