Offset and backspace are not the same measurement with the former being metric and the later being English. The offset is the measurement from the centerline of the wheel to the wheel mounting surface (WMS), typically measured in millimeters (mm) and positive towards the outer lip of the wheel or negative towards the inner lip.
Backspace is just the measurement from the inside of the inner lip of the wheel to the WMS. For the C6 5-spoke wheels, those measurements are 6.84" and 8.68" front and rear respectively by my measurements.
Wheel adapters are generally required in order to reduce the backspacing and get it in line with something more compatible with first gen F-bodies. The rears are going to typically require a mini-tub, flared quarters, or something to fit without hitting anything.
Tobin
KORE3
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