Foam

Doesn't need to be "concours" by any stretch.
Just needs to work. This foam is hardly seen, especially when it's in "max" a/c position. When in regular a/c position and maybe for "heat"/"vent" /"defrost" might be slightly visible thru the grate in the plenum at the far passenger side. Never really paid attention to that in all the 80s trucks I've had over the years