Looking at the buildsheet from your car, or the buildsheet from another '77 isn't going to help much. I suppose it would help a little if one's trying to restore a factory airconditioned car that the heated rear glass, harness, & switch had been removed, or vice versa.
On an original build sheet for this plant '77 Pontiac, box 31, IF it's legible will note a two letter (pick) code for the alternator. With no '77 Assembly Manual copies available, & limited info avail in the '77 Service manual, etc, one is left to examine very original cars OR listen to serious collectors/restorers that have... As a long time Pontiac collector, restorer, & original parts provider, original Pontiac alternators, brackets, pulleys, correct water pumps, are something that have a VERY good handle on.
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Buzzards gotta eat... same as worms.
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