You can buy what you need from most any upholstery shop, then cut it out to match the area you wish to protect from sound. Many times they will have a 1/2 inch stranded material made of pieces of fabric and thread. It should be cheap and easy to accquire. Good luck and peace.
Phil
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I am always available to help those that need help. Since my back injury, I cannot work on many of the aspects of the cars, but I can offer the knowledge of my 27 years as a GM technician. Bring the questions on................!