Legacy OMC sterndrives and outboards (including the familiar OMC Cobra) demand precise blade diameter, pitch, and hub specs, so the wrong OMC propeller can sap performance or strain the drivetrain. Our OMC Propeller Selector cross-references drive model, spline count, and usage to pinpoint the correct OMC Cobra propeller or other OMC props, guiding you to a fit that works the first time around.