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I have some 47-55 early
Chevy panel truck seats. Have what I am sure is original fabric. For photos try this link:
http://s715.photobucket.com/albums/ww155/draglinebucket/PanelTk%20SeatsForSale/Cushion sides are the tan-yellow heavy canvas shown in the photos, while tops are plastic/vinyl dark brown, very small pebble pattern, I think, not perfectly smooth. Hope this helps you some on GMC. Let me know (e-mail) if link does not work. Also there are some more words describing in here (Bolt) on Parts For Sale.
