you can contact AD Boivin directly - the 108" x 11" x 1.25" is excellent on the sport - hooks up great and original drive axel tunnel has just enough clearance for the 1.25" lug - I used rails from an Ovation but I'm sure many others will fit as well. The pitch is a little different (2.58" vs 2.52") but with the smaller 7 cog drivers it worked perfectly. The lug pattern on this track is great for the size of the machine.
As for $, there is little difference between the Timbersled 121" ($575) vs the AD Boivin 108" ($500) as the latter has to be clipped. Either way, cost is pretty close to OEM track for the scoots - I've seen them listed for $400 to $600.
These two track options are miles ahead re ability - by far the best mod - other necessary mod is plastic skis for better floatation and less friction. If only Yamaha would offer similar sled again with a 4 stroke - far ahead of the kity cats and 120 sno pros.