Chevrolet introduced the Impala nameplate for 1958, and it would become a mainstay of Chevrolet's model line-up that continues today. Its one-year-only body style debut for 1958 was followed by wildly finned styling for 1959 and 1960, was followed by a mature design of crisp, all-new body lines and General Motors' new full-size B-Body chassis architecture for 1961. With stylistic influences by GM's chief designer Bill Mitchell, the top-of-the-line Impala of 1961 through 1964 became one of the definitive full-size American automobile designs of the 1960s. Designed by Chevrolet Styling Chief Clare MacKichan under Mitchell's influence, the 1961 Chevrolet did away with the Earl-designs fins of the previous decade, replacing it with a bobtail motif of two beads beginning in a V between the taillights and flowing forward to define body-side accents, further emphasized by narrow chromed spears on Bel Air and Impala models. Also in the back were triple taillight treatments, a crossed racing flag insignia at the center of the rear deck. The rear fenders had the crossed racing flags and the model identification script. The front end continued the conservative theme, with a clear family resemblance to the Chevrolet brand. Another design feature of the new Impala was the larger greenhouse to counter earlier complaints of insufficient headroom.