Here is an awesome rail mounted ice scratcher kit that works on all Summits from 2008-2020, and we have mounted them on 129 and 137" XP & XS, and REV GEN4 R-motion suspension sleds with perfect results. These don't scratch the rail because they have a peg to rest on when not in use. They work in reverse without breaking, bending, or binding. They also throw a ton of snow and last longer than the old style with the extra coils keeping them "sprung" for their usable life. Sold as a pair with complete hardware. Again these fit all Summits from 2008-20 and all R-motion from 129-137 to 2020 !