New Impeller Kit contains impeller and gasket Replaces: Kohler 229955 , Sierra 23-3304 Fits the following models that have the early style pump with a round cover. Pump numbers 267373 , 267993 , 256504 , GM35622 , GM35638 Impeller Specifications: Diameter: 50.8mm ( 2" ) Width: 22.1mm ( 7/8" ) Shaft: 12.7mm ( 1/2" ) 6 Blades Replaces: Sierra 23-3304 Kohler 229955 , 250872 , 252475 Fits Models: 8E , 10E , 12.5E , 12.5CF . s/n 296898 and below