Johnson/Evinrude, 8-15HP - 2 1/2 Gearcase - 13 tooth spline, 8HP (4-Stroke) 1996-2005, 9.9HP (2-Stroke) 1974-2005, 9.9HP (4-Stroke) 1995-2001, 12HP 2012-, 15HP (2-Stroke) 1974-2005, 15HP (4-Stroke) 1995-2001