That one could get tricky on yours, Robin has the adaptor plates for the bulkhead using a VXR driveshaft and pump but I am not sure what your spacing is like, are you still using a stock driveshaft length , if so that part would probably work, I have the pump shoe out of my SN Superjet from when I made that guy a pump mold .
Here is what you are looking at, yes it kinda fits, it would not fully seat on the hull because of this one 8 mm headed bolt below the steering cable, (above it on the photo) , however it does look like that bolt could line up with the existing hole in the pump shoe, also it is very tight around the steering cable nut the nut could possibly be rotated to clear also tight around the cooling and bilge lines, with an aluminum pump shoe you should be able to clearance it and make it work .
I included the measurements off of the pump shoe so you would have them they are in the photos, the one measurement that is not clear is is 13.25mm
Now this is an XI so the width of the pump shoe will be the same and the curvature where it meets the hull at the top is the same and the intake grate location should be the same but the 750SX may have the steering cable and or cooling lines in a slightly different location and the depth from the top of where the shoe seats to the bottom of the hull will probably be different as well.
Of course your 750 pump tunnel won't have the trim cable to worry with , one other tidbit of info the pump shoe for the XI is 13070-3713 , the one for the SX is 13070-3708, I have no idea what the exact differences are between the two, it could very well be just a different curvature on the pump shoes.
I think with the Superjet shoe installed I got around 25mm distance to the bottom of the hull as you can see in the third and the fourth pics.
I hope that helps you.
