19111 Arctic Cat (Premium) Arctic Cat SnowTracker to fit many 1997-2009 Aluminum saddle plastic skis.  This Premium kit requires a 1/2" hole to be drilled at the front slope of the ski to provide stability for the front of the U-Blades.  Detailed instructions are attached here and in the package.  Because this product provides a tremendous improvement in traction/handling, sled set up is required to obtain best results. A 2 page detailed suspension set up instructions are attached here and included in your order.