Camoplast brand tracks is by far the most popular among snowmobiles. They're pretty strong and are balanced for smooth operation at higher speeds. If you're mostly trail riding, i would go with a lug height of about 1".
You should be able to find a good second hand or take off. I'd go for a .91 to 1 inch for the trail. Good trade off on traction versus slide wear. There is a good supply of near new take offs as many riders opt for a more aggresvie track from the dealer when they buy them.
The type 121 like yours is the most common out there and on various sleds from all 4 manufacturers.
Camoplast is by far better than Kimpex. I have heard nothing but bad news about Kimpex tracks and other parts for that matter. Most reputable shops won't even sell you a Kimpex.
I did hear from a few people that the tracks Camoplast OE for Cat are the best,especially if your studding it.
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