This is the correct answer. In 1970 I factory ordered a brand new 1970 Plymouth Duster 340, with the vinyl body side moldings ( I lived in an area where people regularly dinged your new car by slamming their own car doors into your car).
The vinyl body side moldings worked well and they did replace the factory longitudinal side stripes. I prefer a car without stripes because no stripes add to the "sleeper" look of the car. Remember, stripes don't make the car faster or perform better. Same with the performance hood with scoops --- it's all for show.
Also, I ordered the stripe delete option --- my car came with the factory transverse tail panel stripe.
My older brother at that time, was a salesman at one of the largest Chrysler-Plymouth-Dodge dealers, and I ordered the car through him. Before I ordered the car, I had access to all the dealership factory order fact books --- the stripe delete and the vinyl body side moldings were well described and actual photos of a car equipped with those options were in fact displayed in the factory order fact books.
I wish I still had that 1970 Duster 340! But I'd take the Demon you describe - all day long!