Introduced in July 1957, the successor for the “Topolino,” the “Nuova (which means “new”) 500" used a layout similar to that seen on the 600 with a rear mounted engine driving the rear wheels and independent suspension on all four wheels. A first for Fiat was the air-cooling of the engine, a two cylinder 479cc unit with 13 hp. This was coupled to a four speed manual gearbox with a floor mounted shift. While the success of the 500 was not what Fiat expected, production of all types of Fiat 500 exceeded four million. Production of the 500F began in 1965 the main changes from the 500D being the adoption of front-hinged doors and a revised transmission. The Fiat 500F was produced from 1965-72 with 2,272,092 of these models being made.