Does anybody have a part number Sierra etc, for the impeller for a 1963 Scott 3.6 hp? And before anybody says they have a cam not an impeller, this engine as forward and reverse and reliable information (my own 2 eyes) knows it has an impeller. I would like to get a replacement, the one that is in the motor is original. It looks good but..... after 49 years how good can it be?