These Goodyear GSCs (245x50x16) are/were the OEM 'Z rated' tire upgrade for LS1 F-bodies and fit on stock 16x8 rims.
Tire were removed from a brand new (see pics below) 2002 Trans Am at only 80 miles and are still in new condition. These tires were selling for over $180.00 each at one point, asking $450.00 for all 4 of them.
Pick up in NJ preferred but will ship for an extra $125.00.