I temporarily gave up on installing carpet on my firewall, but I do want to put something in the car to help absorb the engine noise.

I rummaged through a crate of old interior parts and ran across a few OEM back pads, but every one of them had issues. Since this is a temporary issue, and I plan to paint the back pad tan to match the rest of the interior, I took the worst back pad to work with.

The vinyl material had come loose and the cardboard was falling apart where the OEM mounting clips were attached
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My first choice was fender washers for backing material, but they would overlap each other and the holes were too large for the assortment of rivets I had on hand, so I grabbed a strip of thin SS, drilled some holes to match the holes in OEM 'clips, cut it down and riveted the assembly back in
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Then sprayed some 3M '77' adhesive on the back of the vinyl and clamped it with clothes pins.

There you go ... fixed and ready to paint (after a good scrub-down of course)
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Yup. I've done that. It's a great fix.

I made a sheet metal tmeplate where the cardboard was messed up....test fitted it and then fiberglassed it .....put new vinyl back on. Think there is an old thread on it.