OEM Number:3211113, 19C3982. The 3211113 drive belt was wrapped with high wear-resistant nylon fabric on both tooth surface, which make less noise and improve transmission efficiency. Sportsman Touring 570 Drive Belt.
They are the same # on each belt But the new ones the ribs are much deeper and the outside ribs are much deeper. But I did get the belt on we will see how it works out. I did notice the new belt makes more noise though 
I bought and installed this belt on my Polaris RZR and it slipped very badly. I purchased a Polaris brand belt and it work perfectly. The belts are not the same as OEM. Pay a few extra dollars and get the right belt. Your machine will last much longer.