Original quicksilver part # is 48-76232A-4 15P Fits both my '88 2 stroke Mercury 60hp and my 2020 Yamaha F60, both of which have 13-spline shafts. Runs 5300 RPM on the F60 with a light load in the boat, swapping to something that turns faster. Uses a pressed in hub. $100 + actual shipping cost to you or pickup in either Kent or Stamford.