The motor was just replaced before I bought it. Trying to avoid removing it to get to the transom. That's why I'm looking for something compatible. I know I have to switch to a square/spline which is what the new gimbal ring will be. Start small ....
I have a 1979 (assumed to be MC-1) Stern drive. From pictures and research I e can to this conclusion. I've tried to Google the serial number and went to a local Mercury dealer near me, no luck. I want to to replace the old gimbal ring, spline-spline which is worn with something that is...