Hearth, I do not have them on any of my Deere CTL's....I would like a set, that why I had an interest in your search for them.
nZpatch, greased and sealed like dozer, as far as cost you can, at a minimum double the standard track cost plus easily. It's a little difficult for me to give you an exact figure as I purchased 2 new machines and leased another 6 , all 299XHP units all lumped together and discounted for volume buy.
I can tell you we have over 2500 hours on one machine and the undercarriage measures out at approx 65 percent and we are in a very harsh environment. They are holding up and performing very well for me....again due the extra weigh over rubber your machine needs the ponies(HP) to wear them effectively..I can push allot better on steel than rubber, No spin, all traction. .very nice option if your condition demand a more dozer like track configuration. My 299XHP's are out working my D4's and are doing it on half the fuel and and approx half of the overall operating cost including maintenance now that we are running on steel undercarriages. Off to work now. This 7 days a week nonstop work is killing this old mans back...regards...