I have the book that has that sheet. It's called the 1978 Pontiac Product Manual.
We're getting into the proverbial apples and oranges scenario here. Your sheet is for the Grand Am only, but the thread is about Grand Prixs. When the GA had buckets they had cloth and vinyl or all vinyl. No leather buckets were offered.
Where cloth was used it was either plain cloth called Galante or multi-patterned called Windsor II. The vinyl was called Doeskin. Hope that helps clarify.
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