Found this on the corvette forum:

”Since the offset values of the wheels are well-known, one can compute the hub-to-hub dimensions from the track dimension, and doing the math, they come out the same for for both C5 and Z06....and those (hub-to-hub) dimensions are 66.6" front and 67.2" rear.”

So that makes the front suspension 4.6” wider than a c4. The rear is 4” wider.