I wanna clarify my "hub ring" statement.
The '05 Merc. 60, 4stroke I had was missing that ring. There was a lot I didn't know with the boat purchase in 2017.
My new re-power, 2021 Merc. 115 hp, I think (ass-u-me d) that it has that ring. I bought it brand new so I never looked, I don't know.
However, the gear case diameter is 4 3/4". If a prop hub is 4 1/4" , that prop will not work, as evidenced by the 2 props sitting on my shelf. Another lesson learned concerning propping a boat.
I have no idea about a merc stern drive, but thought worth mentioning.