KP recommends Solas as a stock replacement. Impellers are made in Taiwan, and are very good quality. Skat Trak is a USA made premium impeller, it has broached splines unlike Solas and OEM, which last longer. Skat Trak also uses a stronger, harder stainless steel for increased strength and durability. OEM is original made by Kawasaki, which are very good impellers as well!