Aftermarket propellers maker Michigan Wheel offered a variety of propellers for about every brand and model outboard. A Michigan Wheel
catalog issued in 1958 or later will likely show prop(S) under
Wizard and Oliver heading giving part #s
If you know the shaft diameter, direction of rotation, number of blades you can go thru a pile of props and pick out possibles...
part numbers are usually stamped on prop.

Some catalogs are online. Once you track down the both Oliver and Western Auto part number for prop the search for the needle in the
hay stack odds shift a bit in your favor.
Michigan Wheel may even have one New O,d Stock.
Non members can post a FREE ad on Antique Outboard site.

It may be possible to adapt a prop from a more common motor,