1955 Mercury D-528 Concept
The Mercury D-528 was the largest fiberglass car ever built by Ford and the first Ford product to have a reverse-sloping rear window. It was built primarily to study engineering features like the use of fiberglass, front frame design, safety features, and packaging design of air conditioning components. It has two protuberances in the back that look like very, very large fins. One of them contains a gas tank. The other opens to reveal a spare tire.
Collection of the Petersen Automotive Museum
Image by: Jacob Nuibe Photography