Should a 1967 Mustang Coupe have 2 side view mirrors originally, and is it street legal?
Yup, 'stangs of that vintage came from the factory with one interior rear view mirror, and one external on the drivers side, you could however, order the riders side mirror, as an extra-cost option, so both are correct, and both are legal in all states and countries, unless the driver is handicapped, and requires 3 mirrors.