The ones available from elgin, Ebay etc that I have seen are not usable--they are much too narrow--they are thin. I had several in last batch that the stamped hole would not allow shaft to pass--I opened them up--ran them on test stand 440--there was a weird chatter and noise--replaced them all with good used units and it went away so for time being until good quality units come back--I am using recycled old stockers when need be.