Since the old prop did fit those numbers HAVE to be correct. I hate to suggest this, but did you contact OMC with those numbers and see if they have one in stock? And if not, do they have a replacement that will fit your hub. If there's an OMC replacement # than it should fit your hub. Then you can transpose that number to a Solas or Michigan Wheel or whatever. (And I'd see about returning that 4 blade prop [the new one] to whoever you bought it from, explaining that it doesn't fit and that they sent you the wrong prop.) You're probably stuck with the 3 blade since it's a used prop.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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