They original used a Dupont Flat Grey Enamel Metallic or equivalent, with long code that now matches nothing in the GM Manuals.
Later Manuals and paint charts list that as then being Rally II wheels Charcoal Grey for Firebird models. PPG WE-3681 DDL-32947. Argent for spokes (W35E-3024) DQE-8568.
Various brands offer their version of 32947 Charcoal Grey.
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