Managed to get it installed on one of the 129s. The belt that came with it was too short, so I pulled a snowthrower belt out and it fit fine.
It works great. A couple pics. One shows a light plugged in. I added a 1500w heater for some load and the tractor barely noticed it. Voltage at the 240V outlet shown.
I don't have a clue if was ever installed. It was represented as NOS, but who knows.
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