Its a pretty big fin. (Don't kid yourself looking at the pics.... I have a size 14 ft foot)

This hydrofoil was removed from a Force 120 horsepower outboard will probably fit a wide variety of outboards and Stern drives.

It looks like you just drill four holes and.bolt it.

It's an older piece, been in the sun.  I don't know how strong it is if it fails you i will refund.