Only 547 examples of the 1987 Buick GNX were built – a limited Published on January 19, 2016 in News Wire: Buick’s Performance Legacy: 10 that MatteredFull resolution (2400 × 1800) Only 547 examples of the 1987 Buick GNX were built – a limited-production salute and send-off for the groundbreaking Grand National. © General Motors.