For TohatsuEngines3.25\" Gearcase40-50HP, 11 1/8x13,13 Spline Tooth, RH35hp...thru 198440hp...1984-newer50hp(All except 50C)...1992-newer?To choose your propeller, we kindly advise you to confirm your own propeller\'s (1) brand, (2) diameter, (3) pitch, (4) rotation, (5) OEM number, (6) the engine date to be matched by the propeller, and (7) HP from the manufacturer before the purchase.