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The carb on the 7.5 is different depending on the year and serial number. My Sierra catalog lists a kit #18-7013 for 1969-1973, and no kit for newer ones, but I think the carb with the fuel pump on the side is newer than 1973. At the link below, scroll down to:
7.5 HP
75
Model 75 7.5 HP
At the site, click on all three of the above groups until you find your serial number showing up. I recently went through finding the proper parts for a similar or maybe the same carb you have, and when you get to the parts list for your motor at Marine Engine, and scroll down to the parts list, note that some parts appear more than once if you keep scrolling, with a serial number range listed by the part. I got the wrong float needle that way by not paying attention to serial numbers! There was no complete kit for the 1975 I worked on, but I was able to buy a separate factory fuel pump kit, float needle, and carb gasket kit. Look carefully at the float needle to see if there is a tiny spring in the float end of it – correctly having that spring or not is critical to prevent flooding. The factory gasket kit I got was correct, except for the carb to manifold gasket, which was too big. The float valve seat in the carb I worked on was pressed in and not replaceable.
Dave