The Plymouth GTX (1967-1971) was introduced as the Belvedere GTX in 1967 by the Plymouth division to be a "gentleman's" muscle car.
In 1969, the GTX's sales were hurt when the Road Runner was also offered in a convertible body style. The GTX received minor cosmetic changes, as well as the introduction of the optional Air Grabber hood (standard on Hemi-engined models), which made the hood scoops functional. The standard 440 V8 was still rated at 375 hp (280 kW). The 69 GTX was the last year that the convertible model was available on the GTX (VIN RS27). Chrysler Corporation only made 701 GTX convertibles in 1969. Of those, eleven were equipped with the 426 Hemi; four 4-speeds and seven TorqueFlite automatics.
The 1969 GTX also had standard black lower body side paint, replacing the dual, horizontal "racing" stripe on the lower sides of the 1968 model.
Source: Wikipedia, 2011