Innovations for 1937 included built-in defroster vents, safety type interior hardware and seat back padding, and fully insulated engine mounts. There were three Imperial models in this generation. The C-14 was the standard eight and looked much like the Chrysler Royal C-18 with a longer hood and cowl. The C-15 was the Imperial Custom and the Town Sedan Limousine, with blind rear quarter panels. This model was available by special order. The third model, C-17, was the designation for the Airflow model. They had a concealed crank for raising the windshield and the hood was hinged at the cowl and opened from the front; side hood panels were released by catches on the inside. A Custom Imperial convertible sedan was used as an official car at the Indy 500. The car pictured is Jim Martin's 1939 C-24 7 passenger limousine, believed to be the only 1939 production limo still on the road.