I just got a 1988 bayliner capri 20 footer it has a OMC Cobra motor and stern drive.what i like to no is the HP and what size the prop has to be = the prop i took off ( it busted ) is stamp on it is ( 13 3/4 x 15 ) the number is 391198 and it has 13 spline is this the right prop for this unit <br /><br />thanks jim