Sorry for late response but only saw this posting today. Gene may have been referring to me. Hampton Coach kept trying to convince me that plain gray felt was correct for a 39 Master Deluxe sedan - which I knew was wrong. They did carry the correct material which is #TL-22 currently at $95 a yard (compared to $4.95 for felt). If the info is still needed, here's a link:
https://www.lebaronbonney.com/cart/fabricdesc.php?ic=1059I forget what I paid, but I had them make the panels (since they had the patterns) and all I had to do was install them. I was very pleased with the finished product. Cheers!