Need more info but only have VIN

Thank you so much everyone!! My instinct told me it wasn't b5 and apparently I was correct. Also yeah no engine number after the stripe on the rear quarter. So to find that type of stripe I guess since it was a dealer thing just search ebay for duster stripe. Doubt there is a part number or a reference if the dealerships put them on.

Some of the companies have stripe kits, but that will depend on if you want to paint a silver stripe or if you want a white original looking stripe kit.

Classic Industries: 1972 Plymouth Duster Parts | Emblems and Decals | Stencils and Stripes | Complete Sets | Classic Industries (check out the gold duster one that are plain white).
Year One: 1966-74 A B E-Body 1971 1974 Model Side Stripe Kit

There are other companies that specialize in decals and other restoration sites, so they're not hard to find.