I am working on a WH-7 Wizard and understand that it is a similar motor to the KG-7. However when I look on marineengine.com, it shows the impeller on the KG-7 to be on the prop shaft. The WH-7 is located on the drive shaft. The prop and drive shafts are different sizes. Can someone please tell me what the part number for the Wizard impeller is?