In the first year, Ford sold more than 600,000 Mustang for sale derivatives came quickly as customers wanted to personalize their Mustang. There were numerous body styles, from coupe to fastback to Mustang convertible, and scores of powertrain and styling packages.

Underneath, the 1969 MACH 1 Mustang offered a 250-horsepower 351 Windsor V-8 or a 335-hp 428 Cobra Jet mill. Mach 1 and its stable mate, the Boss 302 Mustang, reenergized the fastback, tripling sales of the body style in 1969. The much smaller Mustang II model, introduced in 1974 as a response to the nation’s “energy crisis,” was the weaker sibling to its older muscle car brothers. The 1974 Mach 1 featured a 2.8-liter V-6 with dual exhaust while the other Mustangs of the period carried 2.3-liter I-4s as the base engine.