I own a 1988 Bayliner with a 125 Force Motor.<br />I hit bottom of the lake which is rock. I damaged the prop and the bottom part of the motor, I call it the little rudder.<br /><br />Do I have to buy a whole new bottom unit or can I replace just the rudder?<br />Do I have to replace it or is it vital to the steering of the boat?<br />Also, my prop comes from a 125 Force, 1988 US Marine. The part number is A665265 or PS665. Do you know the Mercury equivalent for this prop?<br /><br />Thanks for any help or advice you can give.