Oh WOW! Pee-Wee that is a beautiful picture! I suppose it is of one of your trucks. The material shown is what Bill (red58) shows as being correct for Chevy as well as for your GMCs. Mine has a lot of dark green paint brushed on it, but it well may be the same as you show after I took another look. What I have is only partially still in place, but it goes down the middle of the roof and out to about 8" from the sides and back. So the material is still/now available. That's great!
This information will be a big help to a lot of folks doing TF panels and 'burbs. I doubt my panel will ever be as nice as your trucks, but I'm getting there slowly. Thanks very much for your tips and advice!
It appears there several variations to how the inside of the TF panels were finished in the back.
