You can run a four blade but with late model technology in machining, it's not neccesary. You pay more for the four blade and most people would not be able to tell the difference. As already stated, the 653 and 911 are your choices. 653 for 1k to 1.5k and 911 if you're regularly running 2k and up for ballast. Myself, I prefer the Acme, but was totaly happy with my four blade OJ on my last Sanger. And since Sanger uses Acme as original equipment, you probably won't need to fit another key for the second prop.
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