Ford had already decided to make the Mustang a four-seater after the Mustang I concept was unveiled. The 1963 Mustang II was created to bridge the gap between that two-seater and the production four-seater. This Mustang II was actually built using a pre-production 1964 1/2 Mustang body and modified to show some of the styling cues from that Mustang I, including the centered blue stripe.