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The original firewall insulation in my 67 Wagon also disintegrated. I picked up a large roll of woolen carpet padding from a local Habitat for Humanity store and will cut a new blanket out of that.
My wagon had AC orginaly and it was later removed, leaving me with a wide variety of 1" (and larger) holes in my firewall.
I agree that the stoppers help a lot, but the big ones are expensive and mine would fall out. Fortunately, I upgraded my original coil to blue Bosch 1800E coil and so I had to cover the coil hole and the two biggest AC hose holes. So I shaped a piece of 22 gauge (hardware store) steel to cover that whole area. I sealed it with some weatherstrip goop and secured it with several short self-tapping screws. That made a huge difference.
I also got some hardware store red rubber "Plumbing Gasket Material" (it a 4x4" square of thick red rubber) and cut a slice and hole to replace my steering wheel/firewall grommet. That was the other big heat/noise/sound leaker.
Finally, I opened the hood and pointed the car towards the sun, then crawled around under the dashboard and squirted some silicone caulk into every point of daylight I found. I also put some short pan-head screws into some holes.
More in the future (since the car is 40% disassembled), I have been filling the UPPER portions of the body with expanding foam sealant.
Before anyone freaks, I am only doing the areas around the windshield and tops of the accessible pillars. No water gets in there, so there's no issues with creating a rot zone. This should quite the whole enchilada down considerably.
I suggest reading this excellent article:
http://www.shagadelic.org/VW/info/gmbulley-soundproof
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