Original 1967 insulation? above kickpanels.

Mattax said
Interesting. I removed the passenger side and there's a backing board but not fiberglass.

While in there I noticed a plug in the recess where yours is open.

Was the antena cable run through the holeI circled in white?
View attachment 1715485966

Here's mine.
View attachment 1715485967

Here's the insulation and the kick panel.
View attachment 1715485968

And reversed
View attachment 1715485969

I believe so, the insulation is attached to a backing board and the board attached to the car with adhesive, not the other way around like the firewall (with pins).
The insulation is also different than the firewall insulation.

Mine also has the kick panel insulation.

Alan