current Land Rovers. The series II was the first vehicle to use the well-known 2.25-litre petrol engine, although the first 1,500 or so short wheelbase (SWB) models retained the 2.0-litre petrol engine from the series I. This larger petrol engine produced and was closely related to the 2.0-litre diesel unit still in use. This engine became the standard Land Rover unit until the mid-1980s when diesel engines became more popular. The series II station wagon introduced a twelve-seater option on top of the standard ten-seater layout. This was primarily to take advantage of UK tax laws, by which a vehicle with 12 seats or more was classed as a bus, and was exempt from Purchase Tax and Special Vehicle Tax. This made the twelve-seater not only cheaper to buy than the 10-seater version, but also cheaper than the seven-seater Station Wagon. The twelve-seater layout remained a highly popular body style for decades, being retained on the later series and Defender variants until 2002, when it was dropped. The unusual status of the twelve-seater remained until the end—such vehicles were classed as minibuses and thus could use bus lanes and (if registered correctly) could be exempt from the London Congestion Charge. There was some degree of overlap between series I and II production. Early series-II vehicles were fitted with the old 2-litre petrol engine to use up existing stock from production of the series I. The Station Wagon continued until late 1959 due to continued demand from export markets and to allow the production of series-II components to reach full level. Series IIA The SII and the SIIA are very difficult to distinguish. There were some minor cosmetic changes. Body configurations available from the factory ranged from short-wheelbase soft-top to the top-of-the-line five-door station wagon. A 2.25-litre diesel was added to the engine line, which after 1967 included a 2.6-litre inline six cylinder petrol engine for the long-wheelbase models, which also had servo-assisted brakes. 811 of these were NADA (or North American Dollar Area) trucks, which were the only long-wheelbase models made for the American and Canadian markets. From February 1969 (home market), the headlamps moved into the wings on all models, and the sill panels were redesigned to be shallower a few months afterwards. Later still, the rear wheelarch profile was changed, possibly to accommodate 900x16 tyres fitted with snow chains on 1-Ton 109" models. The series IIA is considered