In 1973, the Cutlass Supreme, like other GM mid-size cars, was redesigned. Hardtop models were replaced by new “Colonnade” styling with fixed center pillars. Concerns over proposed rollover standards caused many automakers to phase out their pillarless hardtops and convertibles throughout the 1970s, and the Cutlass was no exception. Despite some initial controversy over the disappearance of hardtop models, the new 1973 GM mid-sized line proved highly successful. Cutlass Supreme coupes had a unique roofline with vertical opera windows not shared with other Cutlass coupes, as well as unique front end styling.