the 1994 and 1995 model year Land Rover only offered the Defender 90, fitted with a 3.9-litre V8 engine and the R-380 manual transmission which was clearly intended as an upmarket alternative to the Jeep Wrangler. Initially, the Defender 90 was only available as a soft-top with a structural roll cage, but a later version was offered with a unique, removable, fibre-glass roof panel or a regular 4x4 hard-top designated as the estate model. In 1997, the final year of US Defender 90 production, the engine was improved, designated 4.0 and mated to a four-speed automatic transmission. In 1998, regulations changed to require the fitting of airbags for both front seat passengers in all vehicles, as well as side door impact requirements. The Defender could not be fitted with these without major modifications, which were not economically viable given the small numbers of NAS vehicles sold in relation to Land Rover's global sales. Land Rover retired its North American Specification utility vehicles at the end of 1997 to focus on its more profitable, popular and upmarket Discovery and Range Rover models, as well as the then newly launched Freelander. In 2020 Land Rover brought back the Land Rover Defender only as the 4 door model with 2.0 or 3.0 engine and standard hardtop and automatic transmission. It then brought back the 2-door Defender 90 model for the 2021 model year. Land Rover 110 in Australia Continuing on from production of the Australian SIII Stage 1 Isuzu 4BD1 diesel variant, Jaguar Rover Australia (JRA) developed an Isuzu 4BD1 (See List of Isuzu engines) diesel powered 110 for sale as an Australia Only consumer product. Between 1981 and 1990, the Isuzu 4BD1 engine was the only diesel option available for Land Rover in Australia. All 110 cab chassis Defenders sold in Australia during this time had a wheelbase of 120 inches in order to accommodate an 8 ft x 6 ft tray. A small number of 6x6 cab chassis Defenders were also made by JRA during this time. While the Land Rover has been in use in the Australian military from 1959, as a consumer product from the 1970s, it fell out of favour as a 4x4 work vehicle while offerings from Toyota and Nissan increased in popularity. Mid-2009, Land Rover expanded the model range to include 110 and 130 cab-chassis, panel van and HCPU versions, and late in the year announced