Have enough to talk about them so Here's a thread..
Sonny this is the starter that mine takes.
Starter Onan 191-1630 191-1667 191-2132 1975-On
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Item Number: 5706 Brand: DB Electrical

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Not sure if mine has a place for one, or if the flywheel has ring gear on it. Gotta do some more lookin! Might have to remove some tin to see in there.

If you post the info off the mfgs label Sonny, I can submit it to ghe zealots over on the stack. They can probably produce a build sheet for your exact unit.
Doc

With Onan it has to be exact.. I ordered a board for mine based solely on the model not knowing that there are a bunch of different versions.. I.E. that board don't work on mine. Fit's right in plugs right up but don't work called dinosaur electronics and they told to verify the numbers on the OLD board yep they were different. put the old board back in. I can start & shut down at the Gen but can only start it from the remote panel... has a bad relay on the board.