Berco does have a part number on the Bobcat T series rollers and the number is in the aftermarket dealers Berco line , but they can get it from Berco , it's only OEM for right now , so the Koreans copied them cheap , and man has it been a disaster , installed a bunch of them and they started going out like popcorn popping , the casuality rate I'd thik is 50% , the company sent replacements and they lasted about the same as the first ones 80-100 hours , this past Friday they gave the first moneitary credit on the original purchase for one company and I went to the Bobcat dealer and paid $682 a piece for them ,paid $360 aftermarket , I for see a lot of credits to come , the time wasted with all the changing them around , and down time was a killer , take care when buying aftermarket ------------the after market tracks don't last either , have tried just about all brands and had the same results , half the time as the OEM Bridgestone who use to sell to us when I was service manager at a rental house , but they cut that out , the aftermarket tracks probally don't last because the rubber is not as firm ---------for now I wouldn't install another track or roller that was aftermarket on a Bobcat