cloth upholstery was offered, with the Custom interior in black or blue. For 1974, the major exterior changes were a revised front end and 5 mph rear bumper, increasing overall length , and a slanted front header panel with recessed headlamp bezels. Louvered steel replaced the egg-crate plastic grille. Front and rear aluminum bumpers with inner steel spring replaced the chrome items, with license plate mountings relocated. A revised rear panel on notchback and hatchback models had larger single-unit taillights, with ventilation grills eliminated from trunk and hatch lids. A fuel tank replaced the tank. Side striping replaced the hood and deck stripes for the GT sport stripes option. The custom interior's wood-trimmed molded door panels were replaced by vinyl door panels matching the seat trim. January saw plastic front fender liners added after thousands of the fenders were replaced under warranty on 1971–1974 models. In February, the "Spirit of America" limited-edition hatchback was introduced, with a white exterior, white vinyl roof, blue and red striping on body sides, hood and rear-end panel, emblems on front fenders and rear panel, white "GT" wheels, A70-13 raised white-letter tires, white custom vinyl interior, and red accent color carpeting. Seventy-five hundred Vegas were built through May. Sales peaked at 460,374 for the 1974 model year. The 264 changes for 1975 included H.E.I. (high-energy) electronic ignition and a catalytic converter. New options included power brakes, tilt steering wheel, BR78-13B steel-belted radial tires, and special custom cloth interior for the hatchback and Kammback. In March the Cosworth Vega was introduced with an all-aluminum engine and electronic fuel injection, the first on a Chevrolet passenger car. The panel express version was discontinued at the end of the model year. Its sales peaked at 7,800 in its first year, then averaged 4,000 per year. Over 1,500 1975 models were sold. Total sales fell to 206,239. For 1976, Chevrolet claimed 300 changes were made. A facelift included a revised header panel with Chevy bowtie emblem, wider grille, revised headlamp bezels – all in corrosion-resistant material – and new tri-color taillights for the notchback and hatchback (although the amber turn signals were nonfunctional). The cooling and durability of the Dura-Built 2.3 L engine were improved. The chassis received the Monza's upgraded components including box-section front cross-member, larger front and rear brakes (with the fronts gaining vented rotors), and torque-arm rear suspension. Extensive anti-rust improvements to the body included galvanized