I found some Pontiac engineering information that suggests that the machined portions of the cast-aluminum Snowflake wheels (both 7" and 8") produced through the 1978 model year were left natural.
It seems that Pontiac began clear-coating all of its cast-aluminum wheels during the 1979 model year. It's quite possible that this was timed when production on the Turbo wheels for the Y89 cars began.
Also, the colored areas were power coat.
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