I didn't have any luck finding a compatible 12V motor at the usual local auto parts places or in the internet.

I think maybe I'll use two six volt batteries wired in series and pull six volts off the center of them. I did that with no issues in my 51 caddy hearse a couple of decades back.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.