One of the easiest ways to distinguish the 1967 Mustang Fastback and 1968 model year Mustangs is by looking at the side scoops. Whereas the 1968 Mustang Fastback side scoops featured two vents on each side, with horizontal bars across them, the 1968 Mustang Fastback model opted for sleeker, more modern vents that are much more narrow and feature vertical bars.