BMC developed a straight-six engine based on the B-series engine in the late 1950s. It appeared in the Austin Freeway and Wolseley 24/80. Although successful in Australia, and tried successfully in the prototype MGC, the cost of retooling meant that the engine remained indigenous to Australia. In 1971, Leyland Australia replaced the Austin 1800 with the Austin X6 range, marketed as the Austin Tasman and Austin Kimberley. This car was based on the 1800s platform but had different front and rear styling and a new interior. It introduced a 2.2 L six-cylinder version of the E-series engine four years ahead of the UK market. It has the distinction of being the first car with a transverse front-wheel-drive straight six. The car was supposed to offer more competition to the Australian big six market but it achieved fewer sales than the superseded four-cylinder 1800. The E series six-cylinder in 2.6 L form (achieved using a longer stroke) went on to be used in the Leyland P76 and the Marina.