New tracks and Undercarriage. I replaced 7 rollers (one was only 2 yrs old) one sprocket (one had dimensions of new) and all of the idlers, front and back. The job only took a couple of days at winter speed....
I ordered the tracks, 4 rollers, and sprockets from Midwest Equipment on EBAY.
(They did not have idlers available for the TL 130) The rollers were excellent from here, they came with new bolts and hardware. Pay the extra $20.00 per roller.
The Idlers, and remaining rollers I ordered from CIS Quality Parts from EBAY. The rollers were a pain in the ass. They did not come with bolts and the bolt hole threads were the wrong pitch or there was too much crap in the hole for the old bolts to thread in. Anyways I had to go to Fastenal and get a tap to clean the threads so that I could use my original hardware - wasted a afternoon figuring that one out.