I just wanted pass along that I have confirmed the large donut gasket which is just before the muffler on ZForce models, can be substituted by Polaris part number 3610047. Depending on whether you go aftermarket or OEM this can be much cheaper or more expensive than the CF part but it is more readily available and faster to get your hands on. I ordered aftermarket from Amazon for under $10 and it came with 2. The Caltric version was $8 for one and had better reviews but hey, I have a backup if it the donut gasket don't last. Mine was toast and the replacement fits perfect!

Good info, thanks. I've had to replace 2 out of the 3 donuts on my 800. One's a different size.