In October 1959 the MP2 Midget was introduced in Japan - updated with such features as a steering wheel, doors, and seating for two. This model had already been sold in the United States since April 1959, as the MPA, although it was marketed as the "Daihatsu Trimobile". Companies such as Boeing and Lockheed used these little vehicles inside of their plants, for instance. The engine was the same (ZA) air-cooled two-stroke one-cylinder design with but an extra made for a sluggish vehicle. The DSA continued to be built alongside the more expensive MP variants into the early sixties. There was again a panel van version also available.