By 1962, more than 1 million U.S. built cars were factory equipped with bucket seats; often, these were fitted with a center console containing a gear shifter and other features such as ash trays, cigarette lighter, storage compartment, and power window controls between the seats. Large luxurious front bucket seats (and contoured "bucket-style" rears) made their debut in American personal luxury cars with the debut of the 1963 Buick Riviera in late 1962 as a 1963 model. The popularity of standard bucket seats exploded with the advent of sporty compact cars (known as "pony cars") pioneered by the hugely popular Ford Mustang in 1964. With the introduction of subcompact automobiles in the U.S. in the early 1970s, such as the Chevrolet Vega and Ford Pinto, bucket seats were used due for the same reasons they had originally appeared: lack of seating room and floor-mounted levers for the gear shifter and parking brake.