Refer to your snowmobile dealer, owner's manual, or check online for your particular model. We have a fitment guide that we can help you decide but in the case of used sleds, you want to be sure previous owners did not change to a different length or pitch.
All Composit tracks are 15" wide and for Summit riders these will fit perfectly in place of your 16" wide track. Simply choose the correct length/pitch that your sled requires and then choose the lug height that best fits your needs and will still give you adequate tunnel clearance.