Took this track off of a 2003 Polaris Pro X 700 and am just trying to figure out what track it is. Lugs appare to be about 1.75-2". Pretty positive it is also a 136".
I believe that it is a 2002 and before model. That lug pattern basically sucks. The narrow lugs on each edge are pretty close to worthless. Which leaves only the lugs down the center, that are working for you.