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if they fit the c6 lg would call them c5/c6 headers they would have the same part#s price would be the same. if they are cheap buy them and sell em to make a lil profit towards c6 headers.
They should fit but not totally perfectly, it could be a little close in a few areas.
Cartek Racing had one of the first C6s to ever be modified (August/September 2004) and there were no 'C6 specific' headers out at that point so they used C5 headers and they fit with only some minor 'clearancing' needed.
The bellhousing on the C6 is larger than the C5. The primaries on the C5 headers, after the block, make the turn to the tunnel sooner and they will not clear the C6 bell.