The SII and the SIIA are very difficult to distinguish. There were some minor cosmetic changes, but the most significant change was under the bonnet in the guise of the new 2.25-litre diesel engine. Body configurations available from the factory ranged from short-wheelbase soft-top to the top-of-the-line five-door station wagon. In 1967 a 2.6-litre in-line six cylinder petrol engine was introduced for the long-wheelbase models which also have 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.