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Here is who is shown on the Prestolite page... not sure if its helpful.
I would call any local alternator repair shops (if you can even find one) to see if they can service what you have.
That price point has moved up: https://prestolitesuperstore.com/Category/110-489/Prestolite-Leece-Neville-8MR3005C-New-Alternator-8MR-Series-Spool-Mount-type-24V-35A/
Only units I see available right now online. Rebuilding will be cheaper.
I would think that 3-4' is a pretty nominal run, so you may be able to just run the stock 1.25" NPT up (or a lighter weight tubing). You may or may not elect to install a piece of flexible exhaust tubing in the run to isolate vibration.
Just go with something made to work with the MEPs (and will readily fit into a 2" NPT fitting): https://www.steelsoldiers.com/threads/generator-aux-fuel-adapters-and-new-scepter-fuel-cans.217904/
The brass tube won't be long enough to get to the bottom of a 275g tank, but a length of oil proof...