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In case you need it, here is a good write up on how to install it. Takes a small amount of fabrication. I followed these instructions, it was quick and easy and it works great.
https://www.steelsoldiers.com/threads/modern-24-volt-alternator-install.177577/
I actually just looked in my search history and found it. If you google "Delco 21si alternator", it brings up a list of different makers. I bought my on Amazon, made by East Lake Marine Electric. They list one for $119 that I believe is the same one I have. I will double check this evening.