I have a 1989 winner fish and ski ZZ 880 MACH II, 1300 lbs, 18' length, 7'-4" bow with an 1988 Merc 115L6. I bought it with this stainless steel prop on it, and with a whale tail. Numbers on prop: 48-72760A4, and on other side, well, here are photos of the sides of the prop... Question is, I've...