Plymouth Duster 'Correct Exterior Treatment'
69,
There has been a thread or two on this. ..and a lot of comments :) According to some folks on this board that are way more knowledgeable than I, the stripe is supposed to pass through the gas tank tank cap.
http://www.forabodiesonly.com/mopar/showthread.php?t=219729&highlight=body+stripe+location
look farther down and you will see duster stripes as well..
In your mother's case, I suspect that the stripe was been installed by the dealer.
Grassy