OK - about the bumble bee stripes on a Challenger. They were always painted on from the factory and never vinyl. The reason is quite simple, the vinyl material from the late 60's was a calendered material that could not conform to such complex curves. Also, when a car was coded to get a tail stripe, the stripe color was painted on the rear of the car first and then masked off. Again, the reason is very simple: it takes a heckuva lot less material and time to cover up a little stripe and shoot the rest of the car than it does to tape up and mask the entire car in order to shoot the stripe color. As such, a car truly restored to OEM standards would have a paint lip that is reversed versus painting a stripe on after the car was already painted, in other words, the stripe would actually be lower than the paint on the body.
Also, as mentioned above, there was never any clear used from the factory. All paint was single stage back then.