The estate version of the Fiat 500 is the longest running model. The engine is laid under the floor of the boot to create a flat loading surface. The roof on this model also stretches all the way to the rear, not stopping above the driver and front passenger as it does in other models of the same period. The K also features "suicide doors" and was the only model to continue to sport this door type into the 1970s. In 1966 production was transferred to Desio where the Giardiniera was built by Fiat subsidiary Autobianchi. A total of 327,000 Giardinieras were produced, later examples having Autobianchi rather than Fiat badging.