Not to sure if this is the right forum for this but anyway, I have a 04 mxz 600 sdi adrenaline, with a 121 track. I do about 60% trail and 40% deep snow, I find I do a lot of spinning even on our trails up a lot of the big hills and on take off causing me to lose speed. I found this conversion kit for a long track and have a few questions. question 1- why does this site say this extension is for my sled https://www.denniskirk.com/slp/tunnel-extension-32-484.p492820.prd/492820.sku even though its 121 not 144? Wouldn't this be the right extension? [URL=https://www.denniskirk.com/slp/tunnel-extension-32-489.p492823.prd/492823.sku]https://www.denniskirk.com/slp/tunnel-extension-32-489.p492823.prd/492823.sku.[/URL] Question 2- Lets base this off the first one, which does it extend my track too? 151-156-159 or 162 . Question 3 is I was looking at a 1.75 lug track, can I clear that or will it rub on my tunnel?