As long as it is tire nutso time here is the 1969 Z28 Firestone variant. Not easy to find and no repops.
Pic 1 is the more common "WIDE TREAD GT" GoodYear
Pic 2 is the Firestone version "SPORT CAR 200"
Both were E70x15.
Firestone version has only been observed on 1969 models in my limited experience with these.
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