Seeing a growing market, some American companies developed and marketed what they called sports cars. These usually were sporty cars with sports car looks, but lacking in sports car characteristics such as good handling. They sold in low, sometimes hardly detectable, volumes, so their bodies were often made of fiberglass to save production costs. I wrote about some of them here. As it turned out, the only market success was the Chevrolet Corvette that remains in production more than 60 years later.
For this post, I deal in more detail with the 1954 Kaiser Darrin. Its Wikipedia entry is here, and another fairly lengthy treatment is here.
I stand by the assessment I make in the post linked above, where I stated:
"Kaiser was on its way out as a mainstream manufacturer, so the Kaiser Darrin can be seen as one of the company's last-ditch dice rolls. Darrin himself had been involved in custom coachbuilding for many years (think Hibbard & Darrin of Paris, late 1920s) and had been a styling consultant to Kaiser. The fiberglass-bodied Kaiser Darrin sat on a Henry J (compact Kaiser line) chassis and also hewed to the prevailing sports car fashion -- but with several distinctive twists. Most obvious is the tiny grille that makes me wonder if the radiator was given as much cool air as it needed. Then there are the sliding doors that, according to the [Wikipedia] link, proved troublesome. The back fenders had a falling-to-the-rear shape that terminated in standard Kaiser sedan tail lights."