Since the car chase in Las Vegas would have many car crashes, the filmmakers had a product placement arrangement with Ford to use their vehicles. Ford's only demand was that Sean Connery had to drive the 1971 Mustang Mach 1 which serves as Tiffany Case's car. A Mustang was used in "Goldfinger" and "Thunderball", while a Mercury Cougar was used in "On Her Majesty's Secret Service", and "Bond girls" drove each one. The Moon Buggy was inspired by the NASA Lunar rover, but with additions such as flailing arms since the producers didn't find the design "outrageous" enough. Built by custom car fabricator Dean Jeffries on a rear-engined Corvair chassis, it was capable of road speeds. The fibreglass tires had to be replaced during the chase sequence because the heat and irregular desert soil ruined them.