The first fleet of Autopia cars were dubbed "Mark I". Throughout Disneyland's first few years, Autopia went through a few fleets, as the cars took much abuse. Though basically the same look, they went through Mark I, II, III, and IV by 1958. When the Monorail, Submarine Voyage, and Matterhorn debuted in 1959, so did a new fleet with an all-new look – the "Mark Vs". The next design, Mark VI, came in 1964. It was at this time (1965) the center guide rail was first installed. 1967 brought another new design, the Mark VIIs, which cost $5,000 for each car and looked similar to the new Corvette Stingray. They would remain in service through 1999, till a breed of Mark VIIIs would hit the Autopia roadway. The cars were manufactured by Intermountain Design, Utah