It turns that once filming was completed, the on-set Mustang was sold and entered someone’s private collection
somewhere in the US, supposedly in Kentucky. That’s been known for years, and McQueen himself wrote to its owner in 1977 asking to buy it back for personal reasons. But what happened to the second one, which many claim was sent to the crusher, has remained a mystery. That is, until now. According to a member of the Vintage Mustang Forum
, that stunt Bullitt Mustang has been found in Mexico after a decades-long disappearance. He says it was about to be turned into an Eleanor, which would have totally ruined the car and its history for the required exterior modifications.