Yea, those replacement kits can get ya. This is a case, where you want to pull it down before you buy parts, because "life is like a box of chocolates. You just don’t know what you’re going to get"
Going to these later style kits, is not a bad thing though. They are made pretty good and now, easier to get, incase your impeller housing is shot. Now, the factory style impellers can be purchased pretty cheap on Ebay.