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I'm in the market for new tires, problem is the sizes that I purchased 2 years ago are not the right size. see pictures Proxes tire sizes in the fronts are
Front 245/45z18 and rear 275/40ZR18
IF they ARE Z06 widths, 9.5" front and 10.5" rear, the tires you presently have on them will physically appear to be too narrow for the wheels. That's one way to tell. Also, if you pull the wheels off, they may have the size stamped somewhere on the inside of the rim, like on the back of one of the spokes or on the center section that bolts up to the hub.
If the wheels ARE 18x9.5 and 18x10.5 I'd suggest 265/35 fronts and 295/35 rears.