I was curious as to the stock specs for the C6 brakes, so I googled it. And found this post... look familiar?
I then went on to do more research, and came up with this. Numbers are diameter x thickness.
Base 2005 Corvette:
front: 12.8 x 1.26, two-piston calipers
rear: 12.0 x 1, one-piston caliper
Z51:
front: 13.4 x 1.26 cross drilled, two-piston calipers
rear: 13.0 x 1 cross drilled, one-piston calipers
Z06:
front: 14 x ? cross-drilled, six-piston calipers
rear: 13.4 x ? cross-drilled, four-piston calipers