How about WRP inserts, seem the same as BB but also have sidewall support
these will be going on my '12 when it arrives
https://www.rockymountainsnowmobile...ntain_Tuff_Polaris_RMK_Runningboard_2011.html
http://www.youtube.com/user/MarcWRP#p/u/4/6CcftHmbNE0
I'm tellin' ya, anything that goes up the sides with any kind of a ridge will hold snow and build up into a nice bulging ice bump on the side of your tunnel forcing your feet outward. It will suck, trust me. Not the product, but the build-up. I'm not here for any one particular product, just my experience with BB's, Mh's, and the Poo tunnel supports. I had the bending in the bottom of the stock cleats and thought those would solve my problems. It was exactly opposite, and now they are sitting on my shelf. I'm a little pissed that I drilled all the holes in the side of my tunnel. I knew better before, but I thought since they were OEM Poo parts that they would do the trick. Research and talk to people who have had all of the above and make your own decision before you cut, drill, or change anything running boards on these sleds.