Your original 29-175 prop measured 12 X 13 but but Michigan supplied them in 10, 12, 15 and some other pitches. I think 29-39 was the original P/N for a 12 X 12 but I might be wrong. The last known good number for the 12 X 13 prop is 375581 and no, a prop from an 18 or 20 won’t fit as the PO has a much larger diameter shaft and drive pin. I’m pretty sure props from the other PO family of motors (Sea Horse 24) will fit though.
Here’s a snip from the ’42 Michigan catalogue. Check out those prices when an aluminum prop from your friendly Johnson dealer was around $5.25 back then!
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