I am cleaning my shed out & have a full replacement kit hardened standard rotor rasp bars I bought on a pallet of parts years ago. I have 6 flat & 20 helical made by NEW Castings out of Spokane, WA. I installed the ones for a specialty rotor & run 12000 acres of corn & soybeans through & can't tell the difference from new. They wear very well. Thought I would try to recoup some money before they get taken to the iron dealer.