I noticed the firewall insulation hanging down behind the dash (again). Last time I had the dash out, I duct taped what I could reach. The tape held, but the insulation has since further disintegrated , and I deemed it not worth salvaging. Out came the shop vac, and I sucked most of it out. I presume it is a prerequisite to pull the lower dash and/or the heater box in order to replace the pad with a reproduction. Does this sound correct? Anyone have a recommendation on how to proceed? Does it sound reasonable to cut pieces of my spare package tray insulation, and try to stuff or glue it in behind?