Looks just like my F-5 '69 coupe! Or is yous F8? The stripe looks factory correct to me, except too shiny for vinyl and it should terminate in the rear about 3/4" to 1" from the tail light.

If you ordered Formula S, you got the stripes unless you ordered stripe delete.

This photo shows the factory vinyl stripe on original factory paint without the tail light.

23 Body in white.on rollers1a.jpg
If you don't see two dolphins, you need a vacation.