I have two 275/40ZR18's for sale with 75+% tread left. They're Goodyear Eagle F1's, which I'm told are the same ones that come on newer Vette's. I'm not sure whether they're the GS or GS-D3's, but even the less expensive GS's sell for $275 each on TireRack.
They rubbed a bit under hard cornering on my '91 NA 2+2 with stock suspension, so you'll probably want to use these on one of your other performance cars. I'm looking for $350 shipped to the contiguous 48 states for both. I will consider offers.
Thanks
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** Two Goodyear Eagle F1 275/40ZR18 tires ** - Nismortare15:23:56 11/20/06