Miller would be correct. They had a huge surplus on eBay for a long time when the 04+ first rolled out. Not sure how easy they are to find now, but you can also can get these puppies.
Now these are the Sex!!!!
eBay Motors: Corvette Camaro Firebird Trans Am Pair Exhaust Tips NEW (item 280251332288 end time Aug-08-08 18:11:52 PDT)