My buddies have been running these tunnel BRP Ice Scratchers on their Poo and Doo's last year with great results and doesn't beat up the paint on the skid like the wire ice scratches seem to do.....at least for me. I thought if these work for Poo and Doo, they must work on Cat and Yamaha. Very easy install. BRP part #860201516 Only addition to what came in the kit was to purchase two shorter bolts from which came in the brp ice scratcher kit. The bolt that I used to mount the ice scratchers was: M10X1.25X90. This bolt essentially replaces the stock hex bolt that is in the hanger now for the upper idler wheel. I then had to drill one hole for the spring to feed into at 2 o'clock. Then you need to Drill two holes in the inner side of the bumper under the tunnel and use two rivets that came with the kit to hang the ice scratchers when not in use. Very easy install and has great down pressure and won't scratch my rails!