OMC back in the day sold test props to their dealers. Many variants were made and varied slightly to account for horsepower within the same product family. Here are some part numbers that will probably work on your engine: p/n 384933 115/125 hp. p/n 386246 135 (90/110 hp 86-88) The main difference between wheels in the same family was the WOT rpm that could be obtained by that hp engine. All are NLA, but are readily seen sold on places like ebay. These number used to be identified in OMC's Service Tool catalog.