6593
Hey Tim,
The part number Erich gave from the manual is no longer in use by oberdorfer and I found it hard to cross reference. The current oberdorfer impeller part # for their current model pump is 6593. I'm not absolutely clear if these fit on our pumps but PYS has a bunch of the correct impellers for us, along with the paper style cover gasket and snap rings. Just tell them the engine model. Hamilton and Boater's world were not able to find me an impeller to fit.
BTW, Oberdorfer told me on the phone that the cover gasket they make now is a rubber o-ring type, but I wasn't able to find that at PYS and I don't know for sure if it will fit our pumps.
Hope that helps,
Chris