In 1957, Hindustan Motors, to further earlier collaboration with Morris Motors, who by then had become British Motor Corporation after merger with Austin Motors, entered into an agreement to manufacture 1956 Morris Oxford series III in India. All the tooling was transferred to Uttarpara plant in India. The car was rebadged as Ambassador (later called Mark 1) was launched in mid-1957 and the early model Morris Oxford series II derived Hindustan Landmaster was discontinued.The new model included deep headlamp cowls and small rear wing "tail fins". The dashboard and steering wheel were completely redesigned. The Landmaster's flat-plane two-spoke steering wheel gave way to a dished steering wheel with three spokes made-up of four wires per spoke, for the Ambassador. Also a new, dimpled bonnet made its debut. These models had an Austin Motors derived 1476 cc side-valve petrol engine. In 1959 the side-valve engine was replaced by a 1489 cc, 55 bhp overhead-valve BMC B-series petrol engine.The Hindustan Ambassador MK1 was introduced in mid 1958 and came with the same side valve engine that was available on the Landmaster (MK1).The car of course went through major changes in terms of its body with a new front end, new grille, new bonnet and most importantly, a new tail section with tail fins. The tail fin design would essentially stay nearly unchanged till the end of production in 2014.