Two-seaters, wagons and rally cars: The Ford Mustangs that never were

It's hard to sustain any model of car over a couple of generations, let alone 50 years as the Ford Mustang will mark next year. Auto executives want to make their mark with something new, not wrestle with bringing someone else's old ideas up to date. There's always pressure to either cut costs or grow sales in ways the dilute what made a particular vehicle successful in the first place. And customers tastes change, along with regulations, in ways that inevitably make key features obsolete.