if all else fails you can contact
www.boyesen.com ,800-441-1177. they will be able to make a new set for it.you might get away with flipping the reeds over.
you must be one of the last few that has there MT57.i bought one of the first engines when they hit the market,won't make that mistake again.
like 08 said it does make good power but mine was a shaker.at the time after I got rid of mine, they found out that the prop hub was drilled off center.when you mount a spinner the prop bolts wouldn't line up.