On the XFR and TRANSFER rear suspension, there is a set of holes in front of the forward suspension arm. These holes are intended for installing ice scratchers.
If you ride on hard-packed trails, a set of ice scratchers is essential for preserving your hi-fax and extending its lifespan. Without snow lubrication, the hi-fax can run dry, causing friction that heats up the clips on the track, potentially melting the hi-fax and wearing it out quickly.
Ice scratchers kick up snow and ice, keeping the hi-fax and clips cool and wet in hard-packed conditions.