I’ve recently acquired a 1963 Johnson FD-17B 18HP. The previous owner had it converted to remote control and removed the tiller arm, and the Gear and Shaft Assembly. I need the tiller. I just figured I’d remove one from one of my older 18’s and replace it. Don’t work that way, shaft is too short measuring only 8″, I need a longer shaft. Parts on MarineEngine says I need part number 377631, but all I see are measuring 8″ stating “short shaft”. Maybe there’s a different part number I should be looking for? Any ideas??? Thanks.