The 3211130 is the 09 S model belt. From what I understand the 2010-2011 S belts are a little wider and the rubber is somehow improved. I am on my third belt in 3700 miles. The second one I used was a Dayco and I wouldnt recommend it. I got about 700 miles out of it. However, I would say for a spare the 09 S belt, 3211130, would be a great spare at that price, if its a Polaris OEM.