For the MkIII MG Midget (1966-1974) the engine now grew to 1,275 cc using the development seen on the Mini Cooper S. Output was 65 hp (48 kW) at 6,000 rpm and 72 lbfÂ·ft (98 Nm) at 3,000 rpm. However, this was a de-tuned version of the engine that was given to the Cooper S. The Midget retained the standard 12G940 cylinder head casting that was common to other BMC 1300 cars, whereas the Cooper S had a special head with an extra two bolts to fasten it to the cylinder block. The hood was now permanently attached to the car. There were minor changes to the body in 1969 with the sills painted black and a revised black grille. "Rostyle" wheels were standardised but wire spoked ones remained an option. The square shaped rear wheel arches became rounded in January 1972. Also in this year, a Triumph steering rack was fitted, giving a gearing that was somewhat lower than earlier Midgets. A second exhaust silencer was also added in 1972.
In order to meet US federal regulations, large black plastic bumpers (usually called rubber bumpers, despite not actually being rubber) were added in 1974, to the front and rear and the ride height was increased. The A-Series engine was dropped to be replaced by the 1,493 cc unit from the Triumph Spitfire and a modified Morris Marina gearbox with synchromesh on all four gears. The round rear wheel arches were now square again to increase the body strength.
The last car was made on December 7th 1979 after 73,899 of the last version had been made. There was no Austin-Healey Sprite equivalent. However there was a limited number of cars produced in 1980 of the MG Midget.Source: Wikipedia.