the mid-size Chevrolet Chevelle. Impala Sport Coupes had a graceful fastback roof line, which flowed in an unbroken line into the rear deck. In keeping with federal regulations, safety features were built into Impalas during the 1967 and 1968 model years, including a fully collapsible energy-absorbing steering column, side marker lights, and shoulder belts for closed models. Most engine offerings were carryover from 1966 including the base 250 cubic-inch Turbo Thrift 6 (155 horsepower) and 283 cubic-inch Turbo Fire V-8 (195 horsepower), and optional 275-horsepower 327 cubic-inch Turbo Fire V-8 and 325-horsepower 396 cubic-inch Turbo Jet V-8, with a 385-horsepower 427 cubic-inch Turbo Jet V-8 now the top offering as the high-performance 425-horsepower version of the 427 offered in 1966 was not listed in the 1967 specifications. The two-speed Powerglide automatic was the only shiftless transmission offered with the 250 6 and 283 V-8, but the three-speed Turbo Hydramatic was now available with the 327 V-8 along with the big-block 396 and 427 V-8s. New options for 1967 included front-disc brakes (standard with the SS-427 option), stereo 8-track player, fiber optic light monitoring system and vacuum power door locks. Cloth-and-vinyl upholstery was standard in most closed body styles, but all-vinyl upholstery was a new option at extra-cost in several colors on all sedan and coupe body styles (heretofore all-vinyl trim was offered as an option on the Sport Coupe and Sport Sedan hardtop body styles in "black" only since 1963), and remained standard equipment on convertible and station wagon models, again in several colors. All Impala models for 1967 also featured upgraded door panels with carpeting on the lower section. A black four-door version of this vehicle, nicknamed "Baby," is featured in the CW television show Supernatural. 1968 The 1968 model's front end received a facelift similar to the 1965 model, while rear bumpers held triple "horseshoe" shaped taillights. The formal Custom Coupe, previously a Caprice exclusive, became available as an Impala. Most Chevrolets got hidden windshield wipers. Plush new interiors also helped attract buyers. Impala overwhelmed the sales charts, as it had for years. Full-sized cars could have a 250-cubic-inch six, a 307-cubic-inch V-8, either of a pair of 327s of 250 or 275 horsepower, or a 325-horsepower 396-cubic-inch V-8. Topping the list was the big 427, rated at 385 or 425 horsepower. The two-speed Powerglide automatic transmission was still available with the 250 six-cylinder and 307 or 327