Try the 15.5X17 and see how it runs first. That big of a boat will like a large diamter prop(like a MIRAGE) or a 4 blade to get enough surface area so it will stay on plane at slower speeds. As for an anode, get teh smooth MERC one for it if you replace it. The one with a skeg fin on it will need trimmed to clear the larger diameter props.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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