Jeff very nice article. Wish there was a way to enlarge the pics so as to see it better. By the way the few converts I took apart in the 80's did have this type of material on the floor pans and transmission tunnel, floor pans rear and I believe under the rear seat as well. Wish I had documented it back then and not just thrown it out. Here is a piece of the material I've been saving for my car. Can't figure out if its from a 68 or a 70 Boss 302 or possibly out of a mid eighties Dodge XXXLong passenger van (made a great cheap tow vehicle when i raced so no jokes).