MERCURY ENGINES
Select your engine size.
9.9 - 30 HP / 3" Gearcase / 10 Tooth Spline
25 - 70 HP / 3 1/4" Gearcase / 13 Tooth Spline
40 - 140 HP / 4 1/4" Gearcase / 15 Tooth Spline
90 - 300 HP / V6 / 4 3/4" Gearcase / 15 Tooth Spline