Michigan Wheel offers 3 different XHS Hub Kits for the Apollo Stainless Steel Prop for Mercury and Mariner Outboard engines. The 120 Hub Kit is used for 9.9 thru 25 Hp with thru hub exhaust and a 10 tooth spline. The 114 Hub Kit is used on models 402 – 500, 650, 60Hp motors 1974 – 1976 and 25 – 80 Hp with thru hub exhaust and a 13 tooth spline. The 102 Hub kit will fit all large gear case outboards with a 15 tooth spline.