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The factory WS6 wheel that was available on '98-'02 LS1-equipped Birds measures 17x9 inches, or a full 1 inch wider than the stock GTO wheel. It is a 5-lug, 4.75-inch pattern with a 50mm offset and 6.95-inch backspacing. They are available on eBay and through restoration sources for reasonable costs. This O.E. reproduction was purchased from Lakeshore Wheel and Tire and retails for $212.50 each (Part No. 65311D-R) in a polished finish. A silver/machine polished wheel is also available under Part No. 65211D-R for $187.50 each. Since the stock tire size on a WS6-equipped Firebird is 275/40ZR17, the MT ET Street Radial fits perfectly.