Production of the 3500 GT started in late 1957; eighteen cars were built that year, the first handful leaving the factory before Christmas.
All 3500 GTs had leather interior and Jaeger instruments. A first Touring convertible prototype was shown at the 1958 Turin Motor Show.
it was also built on a 10 cm (3.9 in) shorter wheelbase, and weighed 1,380 kg (3,042 lb). Front disc brakes and limited slip differential became optional in 1959, and were standardized in 1960; rear discs became standard in 1962.