Iwas told that chrome pin feeder chain would last longer. the one that I have look's like to me that it is chrome pin because the pin is not rusty it's bright looking.It was a extra option you could order I was told.The rim has been on back order because of the center dish is what agchem_agco has said.the part n is 519621.have 40 on back order. Do not know what the part n is for the feeder chain.have it on order from the dealer.Isn71149895 chromed pin.Here it is time to pick corn and cannot get the feeder chain.