I have a 1975 chrysler 75hp outboard. The prop I have is a michigan wheel I believe its a pr82. I want the same prop just new. the one I have is alittle chingered. It is a 18 spline NO through hub exhaust.
Those props are no longer available although you can find a couple on ebay. Look for the diameter and pitch stamped between the blades--it is there on the stock props.
I do have a couple of them so see my private message to you.