I'm trying to determine if the dual striping in on the White and Red cars was something applied by the owners or if there was a dealer out there adding them.
Every car dealer in the world has added tape stripes. New and used.
I remember looking at new cars in 1968 and the dealer had sprayed this texture coat on the roof of a brand new, station wagon green, Sport Satellite to make it look like a factory vinyl top... basically adding a little something to make a car easier to sell.
In the seventies, every auto shop and K-mart had a big display of different rolls of tape stripes, so anyone could buy and apply the stripes.
In short... Who knows? It could have been either.
Nobody, and I mean nobody, kept these cars stock in appearance or performance. The number of them come up these days as "original" baffles me at times.