declaring that it infringed on a driver's freedom of choice, and allowed owners of 1974-model cars to have the seat belt interlock bypassed. The devices were not included in future Nova models. Along with this controversial seat belt interlock, a new, more convenient "inertial reel" one-piece lap/shoulder safety belt assembly was standard for both front outboard passengers, along with a plastic clip attached to the headrest to guide the belt across the wearer's shoulder. Prices Original manufacturers sales prices for the third generation Nova were: Fourth generation (1975–1979) The 1975 Chevrolet Nova was the most-changed Chevy car for that model year. "Now it's beautiful," said the brochure of Nova's all-new sheet metal, "refined along the lines of elegant European sedans." Chevrolet wisely maintained a visual kinship with the 1968–1974 design, and also retained Nova's efficiently sized 111-inch wheelbase. Front tread grew by an inch and a half, and the front stabilizer bar had a larger diameter. Novas now had standard front disc brakes and steel-belted radial tires. The front suspension and subframe assembly was similar to the one used in the second generation GM F-body cars (the Camaro and Pontiac Firebird), whereas the rear axle and suspension were carried over from the previous generation. Coupes, including the hatchback, had fixed side windows (or optional flip-out windows) - the first for a GM vehicle later optioned throughout the 1980s with its light duty trucks (S10, Astro/Safari, and GMT400 trucks to the K2XX series) and vertical vents on the B-pillar. All Novas now had cut-pile carpeting, formerly installed only in the Custom series. Speedometers had larger, easier-to-read graphics. Windshields offered greater glass area. Front-door armrests were redesigned with integral pull bars. The base model carried the inline six-cylinder , , three V8 engines (, a 1975-only option, a and a ) for 1976 only, were offered. Mated to a three-speed automatic, 3-speed manual or 4-speed – V8s only – Which remained the norm through the end of the decade (and the end of the rear-wheel drive X platform). By then, Cadillac had developed its own version of the X-body, called the K-body which was named the Seville, whose styling was distinct from those of its corporate cousins, and Buick replaced the Apollo with the Skylark name that had been inactive since the previous incarnation ended production at the end of the 1972 model year. The LN (Luxury Nova) package (which was the