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The front lights were modified to conform to new standards and in 1957 parallel windscreen wipers were substituted for the original "cross hands" ones featured at launch.
Although the car was subject to various improvements during the production run, these were mostly very minor in nature.
Due to the difficulty of obtaining steel, aluminum was used for the boxy body placed on top tof a very rigid fully boxed steel frame and and has been used on the Series models and is still in use on the Defender models, the latter the model that is the most direct lineage from the prototype.
This was also the year that the semi-circular ring inside the lower half of the diameter of the steering wheel used to operate the horn was replaced by a full circular horn-ring, so that drivers accustomed to holding the upper half of the steering wheel did not need to loosen their grip in order to sound the horn.Regarding the 403 itself there were persistent rumours that the design was one originally intended for a replacement Fiat 1900 which had been rejected when Turin had decided to defer replacement of the Fiat for another four years.Also unusual were the windows in the rear doors that opened fully into the door frame to the point where they disappeared, despite the intrusion into the door frame of a wheel arch which must have made the fit of the window when opened very marginal.An unusual feature at the time was the thermostatically controlled engine fan which cut out when the engine temperature fell to 75°C and reengaged when the engine temperature increased to 84°C.Another little noticed but ingenious feature involved a small hot water based heating device for the carburetor linked to the heater for the passenger cabin in such a manner that it operated only when the driver turned on the heater and not when the ambient temperature was high enough for the heater to be left off.