When Steve McQueen was away from the film set, his car of choice (among many others) for cruising around Hollywood in was this
Ferrari 275 GTB4. The American star took delivery of the car in San Francisco at the time of filming "Bullitt". The current owner recently took the car to Ferrari Classiche, the official arm of the Italian brand providing restoration services, in order to get the company's authenticity certification, knowing that it had previously been converted to a Spider (yes, someone chopped the top off).