I bought a set of black Exo-s and a set of red Kimpex Rush skis. Neither one is a direct fit. The biggest problem I am having is having the spindle fit snug on the rubber bumper stop. The Exo-s came with new stops. I have already added 1/4 inch of rubber shim - still not enough. May need another 1/8 or 3/16. The Kimpex did not come with new/different stops. The original polaris stops are not designed to fit these skis. I am going to take one of the stops and trim the bottom to make it flat and go from there. Very frustrating!!!!! Any thoughts or ideas and suggestions?