best to watch for sale section .. looking for parting out bikes.. shimono makes a rear I think .. but know
know of anyone making chains.. I have a few.. they are hard to come buy in good shape... if you come across
old stiff ones they can be fixed.. with a little love ..
Someone on ebay was selling a skiptooth rear sprocket that fit the newer shimano drive screws. But if you need a regular skiptooth sprocket try ebay, for sale section here like stated above, or a bicycle show.