Not knowing who your usual sores are, have you tried Quinn Cats used part store in Fresno? Fresno Tractor also parts out all brands of crawler, even though that is not the main business.
I would say ask Tom Bentz at "Assasinated" as Ray calls it, on Charter Way Stockton...They might have something. JM
I have D2 tracks, dozer blade and all the plumbing pipes, belly pan track rollers and sprockets for sale. located in south central Wisconsin. Down south for the winter, will be back mid march. 608 219 2164
Would you happen to have a diverter valve setup and the rear lines for a d2?