High Quality Content by WIKIPEDIA articles! The DB Mark III (normally simply called Mark III, even at the time of its introduction) is a sports car sold by Aston Martin from 1957 through 1959. It was an evolution of the DB2/4 Mark II model it replaced, using an evolution of that car's W.O. Bentley-designed Lagonda 2.9 L (2922 cc/178 in³) straight-6 engine, redesigned by Tadek Marek. Changes included a grille like that on the DB3S, a new instrument panel, and available Girling disc brakes. A hydraulic clutch was new as well, and optional Laycock-de Normanville overdrive after the 1st 100 cars or automatic transmission were available. Worm-and-sector steering and a live axle rear end were carry overs. At the rear, the DB2/4 Mark II's tailfins (after the 1st few early cars) were altered to use the rear lights from the Humber Hawk.