If the chains and sprockets were replaced and then never really used, why don't you just spend some time cleaning them up. They won't be worn so a with a bit of elbow grease (and some real stuff), there's no reason you can't still use them. You may still need to replace the chains if they are completely seized, but if they haven't been run very much, just take it to a parts store and get them to make some new ones, rather than try to buy them from an argo dealer. You would save yourself a bit right there I would think...