An earlier thread mentioned another gentleman known for putting modern alternator internals into earlier generator cases. I contacted him about one for a Model T Ford, here is the email reply I got from him today:
"I have not done one yet but have one in production staging.
The cost would be $995.00 exchange plus shipping with a 3 year warranty.
The 6 volt version is 50 amps and has its own internal electronic voltage regulator.
Let me know.
I thanked him for his reply and told him the unit was out of my price range.