Following the success of the 170 model, MB spawned a newer line-up comprising larger-sized sedans and cabriolets fitted with bigger 6-cylinder engines.
The W143 platform was introduced as a replacement for the previously marketed 230(W21) models, having been built with two wheelbase lengths. The cabriolet B, which received the longer wheelbase, was no different from its predecessors, having been equipped with same straight 6-cylinder 2.3 L petrol unit capable of 55 bhp. However, styling differed from model to model with the B having built as a large 2-door coupe while the D models had other particularities such as styling tweaks or increased seating capacity.