In 1970, the Australian subsidiary of BL replaced the 1800 with the modified and facelifted "X6" models known as the Austin Tasman and the more upmarket Austin Kimberley.
These cars featured new front and rear styling and a 2.2-litre 6-cylinder version of the E series OHC four-cylinder engine (becoming one of the first front-wheel-drive cars with a transversely mounted "inline" six-cylinder engine).
Both models had an updated dashboard and interior but retained the "bus"-like steering wheel position and gearshift approach from the 1800.
The MkI Kimberly had a higher power engine fitted with twin SU carburettors (MkII’s reverted to single carburettors like the Tasman).
The X6 series was intended to compete more effectively with the Australian-assembled rear-wheel drive six-cylinder family cars of GM Holden, Ford and Chrysler Australia.
Both of the Austin cars were offered with either 4-speed manuals or a 3-speed automatic.
Mark II versions of both X6 models were introduced in 1971.

The X6 Tasman and Kimberley models were given a model designation code of YDO13 with the Mark II models coded YDO19.

Despite their technical superiority, updated styling, good ride, comfort, interior space and adequate power the "X6" series were somewhat underdeveloped due to a limited budget and so became ultimately commercially inferior to their competitors – eventually being superseded by the Leyland P76 in 1973.

Local distributor New Zealand Motor Corporation initially imported the Australian Tasman and Kimberley models from Zetland, but later assembled most of its stock from CKD kits at its Petone plant near Wellington.
The Kiwi cars had different interior trim materials as part of the 40-50% local parts content common at the time but otherwise differed only in detail from Australian made cars.
They were, however, sold as Morris models instead of Austin.

The Australian-developed 2.2 E6 was also used in UK-built 2200 models
Eventually, by 1973, Leyland Australia had modified the L6 engine and extended the stroke of the 2200 motor to 2600 cc for final use in the Leyland P76 and L6 Marina models.
In 1970, the Australian subsidiary of BL replaced the 1800 with the modified and facelifted "X6" models known as the Austin Tasman and the more upmarket Austin Kimberley. These cars featured new front and rear styling and a 2.2-litre 6-cylinder version of the E series OHC four-cylinder engine (becoming one of the first front-wheel-drive cars with a transversely mounted "inline" six-cylinder engine). Both models had an updated dashboard and interior but retained the "bus"-like steering wheel position and gearshift approach from the 1800. The MkI Kimberly had a higher power engine fitted with twin SU carburettors (MkII’s reverted to single carburettors like the Tasman). The X6 series was intended to compete more effectively with the Australian-assembled rear-wheel drive six-cylinder family cars of GM Holden, Ford and Chrysler Australia. Both of the Austin cars were offered with either 4-speed manuals or a 3-speed automatic. Mark II versions of both X6 models were introduced in 1971.
The X6 Tasman and Kimberley models were given a model designation code of YDO13 with the Mark II models coded YDO19.
Despite their technical superiority, updated styling, good ride, comfort, interior space and adequate power the "X6" series were somewhat underdeveloped due to a limited budget and so became ultimately commercially inferior to their competitors – eventually being superseded by the Leyland P76 in 1973.
Local distributor New Zealand Motor Corporation initially imported the Australian Tasman and Kimberley models from Zetland, but later assembled most of its stock from CKD kits at its Petone plant near Wellington. The Kiwi cars had different interior trim materials as part of the 40-50% local parts content common at the time but otherwise differed only in detail from Australian made cars. They were, however, sold as Morris models instead of Austin.
The Australian-developed 2.2 E6 was also used in UK-built 2200 models
Eventually, by 1973, Leyland Australia had modified the L6 engine and extended the stroke of the 2200 motor to 2600 cc for final use in the Leyland P76 and L6 Marina models.
BMC ADO17