My guess is that it's a ZR1 'vert due to the wheels (they look like an evolution of previous ZR1 wheels) and that the Z06/7 is more for hardcore tracking (coupe). The ZR1 goes up against many cars that have convertibles: R8, F Type, 458, 911, AMG, BMW...
Oh and there's definitely a rear brake cooling duct as on the C6 Z06 and ZR1.
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