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You might get some info here, but best to sign up (if you haven't already) to the equipment exchange section of the board. Post a "want to buy" add in hunting and sporting arms and I'm pretty sure something will turn up. And, welcome to the site
Just the bolt alone? Could be tough. A friend of mine has been looking to replace a bolt out of his M77 (tang safety) for almost a year with no luck. You may have a better chance though, since the MKII is still in production.
Try contacting Ruger customer service directly. Also, try Western Gun Parts in Edmonton.