I've got the 121 to 136 extensions on my sc10. I don't know the cost they were on it when I purchased it from Panteraone, but I beleive he bought them from the local ski-doo dealer. I'm sure you're dealer can find you some!
These guys sell rail extensions, but not tunnel extensions... the thing I like about their extensions above the other ones is that they extend the Hifax groove all the way to the end, many of the others dont. Sorry, they dont have them for your ultra... for polaris they are only for ProX and edge skids.
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