four-barrel, permitted the Z-28 to be available with the 3-speed Turbo Hydramatic 400 automatic transmission as an option to the four-speed manual for the first time. The LT-1 engine in the 1970 Camaro Z-28 came from the Corvette. The new body style featured a fastback roofline and ventless full-door glass with no rear side quarter windows. Doors were wider to permit easier access to the rear seat, and new pull-up handles replaced the old handles, for which the lower button had to be pushed in to open the door. The roof was a new double-shell unit for improved rollover protection and noise reduction. The base model featured a separate bumper/grille design with parking lights under the bumper, while the Rally Sport option included a distinctive grille surrounded by a flexible Endura material along with round parking lights beside the headlights and bumperettes surrounding on both sides of the grille. The rear was highlighted by four round taillights similar to the Corvette. A convertible was not offered, making this the only Camaro generation not to offer one. The 1970 was the first Camaro offered with a rear stabilizer bar. The four-wheel disc brake option (RPO JL8 of 1969) was dropped. Inside, a new curved instrument panel featured several round dials for gauges and other switches directly in front of the driver while the lower section included the heating/air conditioning controls to the driver's left and radio, cigarette lighter and ashtray in the center and glovebox door on the right. New Strato bucket seats, unique to 1970 models, featured squared-off seatbacks and adjustable headrests, and the rear seating consisted of two bucket cushions and a bench seat back due to the higher transmission tunnel. The optional center console, with standard Hurst shifter, was now integrated into the lower dashboard with small storage area or optional stereo tape player. The standard interior featured all-vinyl upholstery and a matte black dashboard finish, while an optional custom interior came with upgraded cloth or vinyl upholstery and woodgrain trim on dash and console. The 1970 model was introduced to the assembly plants in February 1970, halfway through the model year. This caused some people to refer to it as a "1970½." model; all were 1970 models. The 1970 model year vehicles are generally regarded as the most desirable of the early second-generation Camaros, since the performance of following years was reduced by the automobile emissions control