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They could possibly be stock Speedline Z 06 wheels that have been chromed.
The markings GM & Speeline are stamped on an inner spoke on each wheel.
More than likely they are aftermarket & not chromed Z wheels.
Only way to find out is pull a wheel & look at the inner side for stamped markings.
Good luck.
I've heard quite a few people insist that there is no way 335's can fit on this car without either sticking out significantly, or having the wheel wells cut. Apparently it can work though.
House of wheels used to sell those in 18X12" now the only ones you can get are C6 Z06 style.
Can you post up a pic from more of the rear, I'd really like to see how much they really stick out.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.