both in 15-23" pitch.<br /><br />I'm a little confused when you say 'stringer pin' but if you look closely on the pics you can decide if you actually have the splined shaft.<br /><br /> Shortcut to Express picture.<br /><br />If so, even the 4-blade designs will be available.<br /><br />Goggle search forOMC Cobra 800 & King Cobra stern drives: 15 spline prop shaft
returns several.prop "4-blade" johnson -mercury cobra