1975 Dodge Dart Sport Interior Pieces.

The British call them door cards, the Americans call them door trim panels.
If you're willing to paint, open your search to panels of other colors. You can get green, blue, black or tan panels and spray all of them with the same paint to make them all the same color.
If nothing turns up soon, consider going to the Spring Fling Mopar show in Van Nuys this April.