Save your money. Take 2, 12' 2x4's and rip them the long way. Then take the two halves, put them side by side, but with a gap between them that's wide enough for the carbide to slide between, but close enough so that the outer edges of the skis rest on them. Screw them down and, Viola! Instant ski guides for $10 VS. $150, or more. Worked awesome in my enclosed when I had it. Carbides never touched the deck, and the sled slid easy enough to drag it around, but enough resistance that it didn't slide TOO easily. Just taper the leading end a bit. They won't turn into slip/fall hazards like plastic either when you're in your trailer with fresh snow on your boots.