For Nissan, Tohatsu, 2.5" Gearcase, 8 - 18 HP
Mercury and Mariner : cotter pin (14 spline shaft by Nissan) 4-stroke Bigfoot ('05 and newer): 8 hp, 9.9 hp / 4-stroke ('07 and newer): 15 hp, 20 hp
Nissan and Tohatsu : 2-stroke: 9.9 ('84-'05), 12 ('85-'88) / 15 and 18 hp ('85-05) 4-stroke: 9.9 hp, 15 hp, 18 hp, 20 hp (14 spline)