Brad; I think that the black tar paper type material is asphalt impregnated felt sound proofing material, not carpet padding. Carpet padding usually looks like its made out of ground up rags and thread, that type can be bought through an upholstery shop or an upholstery supplier. As for the sound proofing material it's anyone's guess where you can buy it, an auto body shop might know. If you really need new window motors, and can't repair the old ones, try checking the wrecking yards for Chrysler M-bodied cars. From what I recall the Chrysler Fifth avenues, Dynasties, and New Yorkers used the same window motors as the 70's Imperials did. Take one of your old one's to a "pick your part" type yard and compare. Best Regards Arran Foster 1954 Imperial Newport Needing A Left Side Taillight Bezel and other trim parts.