I would look up numrich gun parts on the web. Krag parts are not that common but if you keep looking up places like gun broker and ebay you may find what you need. It may not be cheap though, I myself love recusing old rifles that have been abused by their owners. I restored a lee enfield back to military trim after it had been painted and hacked to death. It even had a glued on scope mount, now it looks pretty again
goodluck in your pursuit there.