Hello everyone! Im posting today because I have a question about water pump kits. Heres my situation...im looking online to find the correct kit for my outdrive, which is I believe either an mr or an alpha,an early one,possibly 1978-1980. I found the proper kit to match my year which is glm #12280,which covers 1973-1990. The kit I would like to get is glm #12120, and reason being is due to the fact that it is a complete kit which,which comes with both the upper and lower pump housing sections. The kit that I know is for my outdrive, #12280,only comes with the upper section for some reason. Well....I want the complete housing! The lower section has a shaft seal in it, so while im in there, heck yea I want to replace it!! If it leaks,theres a bearing directly beneath it that's going to take on water. So, my question is, are there major differences between the pump housings? Can I just buy the complete kit ,even though it doesn't match up with my particular year? Thanks for reading!