The Chevrolet Impala was introduced in 1958 as an up-level sporty trim package of the Chevrolet Bel Air, Chevrolet's most expensive line of coupes and convertibles then. It featured six unique taillights and a distinctive body styling. In the following year, it became a separate model and eventually became Chevrolet's best-selling car for many years. It was also the best-selling full-size passenger car during its production life. Particularly in 1965, Chevrolet produced more than a million units of Chevrolet Impala, a record which has never been matched until now.