Master Craft went to the splined shaft for the 03' model year boats. What motor does your boat have? We offer 3 sizes in the original wakeboard specific OJ XMP EDGE propeller line, 14.25 X 14 LC, 14.25 X 14.5 LC and 14.25 X 14.75 LC 4-blade, available in Spline or 1 1/8". Master Craft uses all of these OJ PROPS as standard with their various motor choices. Please give me a call if you have any other questions.