Nexxtech (Home carbonsled (NEXTECH) manufacturer of carbon fiber snowmobile products) sells and installs the kit. Worth every penny IMHO. Had my M1000 done, then added the valving to my wife's sled (which already had a Holz skid with floats). Night and day difference, quick turnaround time (Tyler was good to deal with), and the suspension finally works the way it should - excellent on the mountain or washed out trail, in fluff or hardpack.