Shoddy Pad Insulation Alternative

It's easily compressible, and about the same thickness as the factory padding. The carpet in both my cars fits and looks like there's nothing under it.

Look how my Gen IV evaporator mount squeezed it to less than a 1/16" or less in the attached photo.

Similar padding is available at Aircraft Spruce, but at a much higher cost. I found virtually no difference from the pad available at Speedway Motors.