Modified cars have existed since cars were first invented. No matter the expense involved, someone has to make their own version of the car. But this car is different. It was actually built by the Ford Motor Company. From the little information out there on the internet, it would seem that they were testing the water for such a concept. Still wondering what it is? Yonah got it right: Mystery Car #46 is the prototype 1965 Ford Mustang Wagon. It never made it past the one-off stage, but it does look pretty good for a two door wagon.