I have the same motor, fourstroke Yami, and at first had it on an OMC bracket. The bracket was for the smaller 15 hp two strokes, etc. After seeing cracks develop and then the piston fail, I too looked hard at the heavy duty model, but 500 bucks was too much for me. I went to Boaters World and bought the Garelick heavy duty model rated for up to 30 hp. web page I have had it for a year in heavy seas, and it has held up well. The outboard also raises and lowers very nicely.
Save some money and buy one of these, ask for an opinion from fellow boarder "AKKings", I think he works there.

Ng
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C/R > A good thing > fish all day,into the night! Steve Ng

Dad, think that if I practice hard, they'll let me participate in the SRC ?
[Gig Harbor Puget Sound Anglers....Join your local chapter. CCA member