Read the article from Jim Carter...
http://oldchevytrucks.com/blog/inde...hevrolet-gmc-gas-tank-and-seat-cushions/

You need to read the whole article and see the addendum at the end. They are not sure what is original for the bottom of the seats. It is also possible that different factories finished the seat bottoms differently. I found my seat bottoms in a junk yard and were not in good condition, so I can't add any information.
Kent


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