Those strips look like they might be the same material that was used in the door panels.
I have some Ford trivia for you:
My dad ran a small truck line in the 60's and 70's that hauled fiberboard panels from where they were made at the Superwood plant in Duluth, MN to the W-K Corporation plant on the west end of town. W-K stamped out door panels, headliners, and other pressed wood fiber parts for Ford. After stamping, they were run through a painting line where they got a coat of primer.
As those parts were replaced with plastics and other lighter weight materials the business dried up.
I remember W-K seemed like a rough place to work. Almost all the forklift drivers were missing a hand. The big presses that stamped out the panels were pretty unforgiving. No OSHA mandated safety equipment on those machines. When you didn't have two hands to feed a press with anymore, you were moved to forklift duty.
The old W-K building is still there, now used for warehousing, I think.
Superwood continued on, making panels for garage doors, hardwood siding, and other stuff. It was bought out by Georgia-Pacific. The plant in Duluth was closed a couple years ago.