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If you have the powerhead off or would be willing to remove it I think you could tell which of your driveshafts would work. A good time to remove carbon deposits and have a look around for other issues.
Hello. Yes that was what I was thinking. I am pieceing together a motor from parts. But everything has a part number on it so everything is correct. Exept drive shaft. Lower unit is original to the 1958 leg it just had an exstension added to make the motor for 20” transom. I will have to measure with the powerhead off the leg and see where the shaft sticks up and make sure the shorter 15” shaft sticks up the same. I am aware different year lower units while they may fit as a complete unit have different gear ratio’s and the drive shaft lenght may vary if you mix the parts from lower units that are pieced together. I could possibly jus measure the height of extension and knock off that amount. Thank You. Bill,