1971 Duster where does interior color start on door

On the two cars we have the 72 has the black metal door sills and black vinyl door panels with a yellow exterior color.
On the 73 it has black plastic door sills with black panels and a red exterior.

They both came this way, so I would think the entire inside of the door would be interior color.
OR some might have had black metal sills with another color on the panels and interior.

Not sure about that one.