[GT182]

Originally Posted by 64gman

It seems as it was some type of felt and it also went under the roof supports. I think they even used the same material as backing in parts of the quarter panels and inside the doors.

As far as I've seen on the 60s Pontiacs I've had, there was no backing material in the doors or rear quarter panels of the A-bodies. Doors had a watershield under the door panel and that was it. Tho some do put some type of sound deadener inside the doors these days. There is a panel with jute backing that goes between the rear seat and the trunk to cut the noise, and keep warmth in the passenger compartment in cold weather.