1967 Mercury Cougar The Mercury Cougar was introduced in 1967 as the more upscale version of the Ford Mustang. It had more mature styling and upscale interior appointments and rode on a three inch longer wheelbase than the Mustang. Yet despite its greater emphasis on luxury than performance, the Mercury Cougar still managed to make its mark on the American street scene. Mercury joined the pony car race full speed with its Cougar, based on a stretched version of the Ford Mustang. Only a two door