15 merc 2 stroke. What prop?

[Wee Hooker]

I've got a 96' 15 merc ( ser # range 0G 355xxx) that is wearing a prop that has seen better days. I'd like to replace it this winter but can't seem to find the factory recomended size/pitch in the owners manual. By my (crude) measurement of shaFt to blade tip, I'm guessing it's a 9-9.25" diamiter but am unsure. Does anybody have access to the "as delivered" prop specs?

p.s. I'm pushing a 14' fiberglass boat that runs in the 650# range fully rigged for fishing. Most days it's carring another 220-450# / 2 adults on top of that. Should I be looking for a specific pitch?
Thanks