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have you tried the for sale secion in the Forum? most will sell them in pairs dont think you will find a single muffler but you never know. What is rattling? Maybe just a rubber grommet??
I think that some of the tack welding inside the muffler tube tends to come undone by vibration. You can pay to have the muffler opened and re-welded or just find one used. Let me warn you that some people are asking mad money for anything npp.
I'd rather buy a new/used set, z06 3" appear to be a little less than the base 2.5", maybe around $500 or so, I recall seeing a single one on ebay, not sure what dia pipe.