Not all of what are now called concept cars resulted in production models. But perhaps the best-known successful concept-to-production evolution was from Briggs, whose lead stylist was John Tjaarda. The resulting production car was the 1936 Lincoln Zephyr, a sub-luxury model that most observers credit with saving the upscale brand from extinction. More information about this can be found here.
Along with streamlining, another popular avant-garde automotive concern during the 1930s and for a decade or two beyond was placing a car's motor at the rear. I find this preoccupation puzzling because having the engine in the rear has few advantages and many defects. So the notion that streamlined, rear-engine cars were the wave of the future was most likely the product of group-think rather than rational thought.
As it happened, Tjaarda's rear-engine Sterkenburg concepts (the name having to do with Tjaarda's ancestry and its lands near Utrecht in the Netherlands) evolved to the front-engine Zephyr. This was a good thing.