View parts diagrams and shop online for WATER PUMP ADAPTER parts, 1992 Stern Drive 5.7 574APEAMH. Offering discount prices on OEM parts for over 50 years. FAST $4.95 shipping available.
www.crowleymarine.com
is what you have, the cone clutch King Cobra? Because there were models that were also called the King Cobra, that were actually still a standard dog clutch Cobra with some special feature (high output engine, thru the transom exhaust, etc).
if so, here's link to the parts, it looks like the water pump repair kit is NLA but most of the individual parts are still listed. Call Crowley and see if they are actually available. The only part of the whole impeller assembly that is not available, is the metal wear plate, those can be re-used, as long as they aren't scored. If they have the parts, I'd buy a few!
The one you posted just above this post looks like the standard dog clutch Cobra impeller, there's no way to know if it will fit and work right.
Other sources for obsolete OMC parts are Sea Way Marine in Washington State, NLA Marine parts, and Ebay.
It's too bad the parts are getting hard to find, I have a bunch of spares for my standard Cobra in my garage, wish I had a Mercruiser!