I recommend that before you go out looking for repair parts, lets make sure you really need them, posting a pic of the tube would be a good start.
Joe.... Know Al B. quite well, on a good day he will try and gouge you. I know a few folks that make "original" parts for Al
As I stated earlier, I just finished making a complete tube assy (inner & outer) for a 22 cal 73, I'll try and post pics later, but they are identical (well except for the lack of pitting on the new one).
But, again, before he goes out looking for a new one, lets first determine what wrong with it, if anything. Not much that can go wrong with them.
V/R
Mike