In comparison with MB-290 models, the MB-320 underwent following changes – it was given a slightly modernized frame and chassis, 3.2-liter, six cylinder engine, and a four-speed transmission.
The Mercedes Benz 320 convertible was available in three different versions – models A, B, and D.
The more expensive model MB 320A was the top of the line sports convertible- Sport Roadster
The MB 320B cabrio -model convertible had two doors, four windows and back seats.
Finally, the MB 320D cabrio -model convertible came with four doors, four windows, and front and back seats.