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You can use 9.5" (or 10") wheels on the front but the 12" Z06 wheels don't really work on a stock body C6. You can, however, use Z06 rubber using 11" rear wheels with the proper offsets. My street wheels are CCW SP16A wheels, 9.5” x 18” front - 11” x 19” rear with the Goodyear Eagle F1 Supercar EMT’s...275/35ZR18 front / 325/30ZR19 rear...stock Z06 tires. This works very well IMO.
If you want a proper fitment with 12" rear wheels you either need to tub your wheel wells or make your C6 look like a Z06.
I like CCW wheels. They make a quality wheel at a reasonable price, they have superb customer service and John (at CCW) is a fitment expert. If you have any interest in CCW wheels I suggest you call John...he'll get you hooked-up right.