Here ya go. Might not be "optimum" but also might be just what the doctor ordered. Not knowing how many splines in your propshaft or how the prop is attached makes finding the exact one for you difficult. Based on what you said though either of these will hopefully fill the bill. Do a search on eBay, I found several more, with widely different prices. Good luck.
http://www.ebay.com/itm/New-PR-78-Mi...dXCH8I&vxp=mtr
http://www.ebay.com/itm/Propeller-fo...FVChdX&vxp=mtr
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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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