There are different pulley widths for alternators available on Ebay. Lots of farm equipment runs a 5/8" wide belt and conversion pulleys for your alternator can be installed with nothing but an air impact wrench. Alternators don't use any kind of drive key on the shaft, just a friction fit.

www.ebay.com/itm/194302388404?
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!