First off, does anyone know where I can order, or where I may find a rear headlinere for my 80's box GM full size wagon. the previous owner let squirrels chew the old one and threw it away, so I am missing the rear board. Second, who has ideas for replacing the sound insulation under the carpet?
I would try a local "Pull-a-Part" salvage yard. You'll probably need to re-cover it, but you;ll have the right substrate. They were common for all the divisions and all (1977-90) years, so you might have a good chance of finding one. If you are replacing the carpet, you can purchase the carpet with the OE type "mass-backed" deadener from ACC or whomever you order the carpet from. I don't know if they'll sell the deadener only, but it's worth asking. I have been very satisfied with carpets from ACC www.accmats.com and from Stock Interiors www.stockinteriors.com. I have also had good results using foil-backed, peel-and-stick roofing seal material as floor deadener. I bought the rolls at Lowes.
Why in the world would anyone let squirrels chew up a headliner? I'd buy some cheap paneling or that silver insulating board from a Home Depot or a Lowes type store and make my own then recover it. And shoot the squirrels.