The 1974 Apollo debuted with only subtle differences. A chrome strip above the grille and roof-mounted safety restraints were added. A GSX package became available on the coupe for 1974, however, it was purely cosmetic changes, lacking the performance upgrades that distinguished it in previous years. It was available in red or white and featured a blacked-out grille, unique striping, white vinyl bucket seats with red interior accents, and wire wheel covers. The GSX was available with the straight six or either 350 V8, and could be ordered with any of the optional equipment available to other Apollo models.
(description text adapted from https://en.wikipedia.org/wiki/Buick_Apollo)