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Alternator pulley

When flooring the accelerator I hear a squeak or something like it. The previous owner tells me it’s the alternator belt, and that it’s unavoidable with a high HP engine. I don’t mind the sound, but I do mind getting stranded somewhere because of a broken fan belt, so I want to try and fix it. After Summit’ing a bit, I’m confused. Serpentine or the like, that costs a fortune. Then I was thinking about a bigger alternator pulley, it’ll slow down the alternator, and it will also provide a bigger area of friction between pulley and belt, that might do it. But the pulleys that Summit shows confuse me a bit:
I.D., most are 0.642, but some are 0.650, are they really that close and won’t fit? What’s the I.D. of our standard Cleveland alternators?
O.D., I’d like to slow it down a little, but the ones they have are at least twice the diameter, it’s quite dramatic to slow it down 50%? Of course my Pantera is not a car that needs a lot of current for wipers and heated rear screens in stop and go traffic…

Has anybody had the same problem? And fixed it? I’d rather not spend a fortune on billet stuff that only I will see when I remove the engine plate. And will a bigger pulley scrape on the plate? I don’t want to modify that plate…
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