First of all, welcome to the Forum!
That will be like looking for a proverbial needle in a haystack. With thousands of old 22 rifles made by several hundred manufacturers. Many of them dissolved and no longer in existence. You might call Numrich Arms also known as Gun Parts Inc. and see if you could send them the pictures of the Bolt? Because if they can recognize it, they might give you a couple of bucks for it. And the other thing is unless someone has actually misplaced and lost a bolt or inherited an old rifle without one the demand probably is next to none. But good luck with your search. If I see anything that looks like it, I will let you know! Is there any other parts that was with it that might give a clue to it's identity?