Funny the Bullitt Mustang has shown up in a couple of places. This one, and one found in a salvage yard in Mexico of all places.
Problem, as there were more than one Mustangs used in the movie. You had the hero car and the stand ins.
If you pay attention to the latest one, comparing it to the movie, it has the wrong driver's mirror, and the rocker/quarter trim and such are not painted. Thinking it was one of the stand in cars, and not the hero version.