Upgrade Kit
That part has been discontinued through Polaris, but you can still get all of the parts individually. The kit retailed for 499.99, but to get all of the parts required, it is 977.98. That is almost double the price. I have the listing and could order you in the parts and then ship them out to you if you would like.
I did this kit on my 07 600 RMK that I had, and it was a noticeable difference in how the sled went through the snow, so it is quite a nice addition.
Give me a call or shoot me back a PM if you have any questions, and I will be more than happy to answer them for you!
Daniel @ Carl's Cycle Sales
208-853-5550