You are correct with your first post:
Rear: 9594810 &/or 9594811 - Wheel size: 18x10.5, Wheel Wt. – 21.0 lbs.
The GM Part # 9594810 is on one of the inside spokes of a rear Z06 mid 2002 to 2004 wheel shipped on a Z06 from the factory and the GM part # 9594811 is the one GM Parts Direct has on a Z06 GM OEM wheel.
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