Some cosmetic changes were added to Mustang II in 1977 to make the car look more sporty. One of those changes was the addition of new bright colors. A T-roof was available, which allowed two pieces of the roof to be removed for a more open feel, since convertibles were still banned by the government. The same 1976 engines were available in 1977, but with a six-horsepower decrease from the 1976 302.

The grille on 1977 Mach 1s was changed to featured more pronounced horizontal bars, and a front spoiler was added under the bumper. The Mach also got new four-way adjustable front seats.

The Cobra II continued in 1977, but with few changes from 1976.

For more info on Mustang IIs, check out MustangII.net.