Story
The 1977 Monza Mirage turned Chevrolet's compact 2+2 hatchback into a street-going salute to the wide-body Monzas competing in IMSA. Chevrolet offered it as RPO ZX1 through participating dealers. Cars left the St. Therese assembly plant in Antique White, traveled through Michigan Auto Techniques in Grand Rapids, and then continued to the ordering dealer.
A body package, not an engine package
The Mirage identity came from its appearance conversion. Michigan Auto Techniques installed 14 reaction-injection-molded body pieces, including front and rear fender extensions, a three-piece front spoiler, a rear spoiler, and finishing pieces. Red and blue graphics, Mirage identification, and blacked-out headlamp and grille openings completed the look. The front air dam traveled inside the car for dealer installation so it would survive shipping.
The standard 84-horsepower 140-cubic-inch four-cylinder and the optional 145-horsepower 305 V8 were both legitimate Mirage powerplants. A four-speed manual or Turbo Hydra-Matic could accompany either engine, while the five-speed was limited to the four-cylinder. The 305, F41 suspension, special instruments, sport steering wheel, sport mirrors, and white-letter radials were recommended together, but none of them defined the ZX1 package.
What the paperwork should show
A MAT-completed car should connect its 1R07 Monza hatchback VIN to a ZX1 order or ship-through record and a numbered MAT plaque. The body pieces were riveted over the factory sheet metal, and the original color path was Antique White code 11 with red and blue graphics. Chevrolet also sold service parts, and some dealers assembled kits, so a correct-looking body alone cannot establish a MAT-built car. A documented dealer installation belongs in the history, but it should not be represented as a numbered MAT conversion.
Published production records do not agree. A Chevrolet RPO-data summary reports 4,097 ZX1 interrupt-shipment orders, while the Mirage registry estimate cited by Hemmings is approximately 2,400 MAT conversions. The difference may include dealer-installed kits, interrupted orders, or incomplete surviving records; this page keeps the two scopes separate rather than turning either number into a count by engine or transmission.