To rephrase what cobain03 tried to say. 2+2 is a designation meaning, 2 seats in front 2 seats in back. It is the official designation used by Ford to identify the 65-66 Mustang "fastback" body style. Fastback was a term used by Ford initally to describe the "new" 63 1/3 Galaxie & Falcon Sprint hard tops. Later the term is widely used to describe acar with a long sloping rear window area.