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That sounds more like an early 10 hp prop. I just checked a Michigan 8X8 I have for the 7 1/2 and it’s shaft is only 9/16″. The other key is drive pin location. On the ten it fits into a slot in the inner hub and the cushion is built into the prop. On the 7 1/2 the drive pin is in the small collar that extends from the rear of the prop and is retained by a rubber cap. The cushion is the same metal spring inside the lower unit that the 5 1/2 uses. I’ve used 5 1/2 props as power props in my 7 1/2 as well as 7 1/2 props for speed on a 5 1/2. Not that either one makes that much difference on those little motors.
That said though I have a prop fetish and through the years have bought an sold quite a few I’ve not owned a two blade 9X8 or 9X9. I’m sure I have 3 blades in both of those right now. The 9X8 being a fairly light load 10 hp prop and I have a freshly hubbed 9X9 on my 18 hp to push my barge of a Lone Star. The only two blades I’ve owned to fit those motors have been Michigan AJCs in 11″ or 12″ pitch.