Looking at the gas tanks from the Evo to the Indy 600. The gas tank on the Evo is slightly shorter than the 600. But the rear bracket is the same. And the front mounting on the gas tank for the seat is the same. It would fit. Why polaris did that beats me. Seems stupid. So that jacks up the price even more in parts and labor to get it converted to a more full sized person sled. Id rather buy an Indy 600 still and make the Evo seat work for the time being.