Interesting. Your lower unit is the same basic shape as mine and the pump housings look the sameish. However, mine has a twist style shift, rather than up and down, and it has a “foot” on the bottom, that has to align with a slot in another shift mechanism in the gear case. This all goes on, AFT of the water pump! Also, I have a tube which must be installed into the pump before the pump is assembled, and then, this tube sticking up, has to align with a hole some inches up in the mid section. I should have taken pictures, but I ain’t taken’ that thing off again, for NOTHING. Aligning all that stuff was hard. I do seem to have the same impellers as yours. I was concerned with mine, because they are bigger in diameter than my originals. When installed, the blades are basically sideways, in some places. I am a long way from running mine, so I can’t tell you if it’s all going to work. In YOUR case, could you do the old drill-on-the-drive shaft trick and see if it pumps in a bucket?