That’s only a 40 amp alternator, probably ok on a deuce with the limited amount of electric items on it, you may notice issues driving at night with the heater on. Stock alternator is 60amp.
Any 21si alternator will work. There are plenty of aftermarket (China) ones out there, $150-200. For a delco-remy you’re looking around $300, but USA made for the most part. You can special order these most parts suppliers like autozone, oreilly, carquest, napa. They usually don’t come with a pulley because most things that take this alternator have a variety of pulley configurations, serpentine, single groove, dual, triple. You need the pulley I sent you on the last message.
I can get you as many of those brackets you will need, $20 each plus $15 shipping. You only need that if you have the old style “bullet” generator with the big cannon plug.
As for wiring, you cap off the exciter wire, and connect the “B” wire to the single post, the larger wire. Run a ground from the ground terminal or the case itself to the frame, there is one there already on your old one. Don’t have the number for the B wire off hand. Simple.
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