Isn't the design timeline off? I thought the Mustang basic style was approved circa 1963 for production, and the fastback wasn't available in the first production run, only when the true 65 (not 64.5) models came out. 1961-1962 seems to be a bit too early for being the design of the fastback. Fairlane, Falcon, Mustang Design Studio in 1961-1962?
Correct me, please, if I am wrong here.