Frequently sharing the same body and power-train as the Century, the Buick Regal was a mid-size vehicle that was produced by General Motors' Buick division from 1973 through 2004. Slow to react to develop in the lower priced mid-size personal luxury market, Buick wanted to market to compete against the Olds Cutlass Supreme, the Grand Prix and the Monte Carlo.
The Regal was introduced in 1973 as a top line coupe located in the GM intermediate A-body line, the Century. This same year also marked the unveiling of the first major restyling of the GMs intermediate A-body design since 1968. This was also the first major restyling for the intermediate based G-body that was used in both the Monte Carlo and the Grand Prix.
The original Regal shared the front and rear styling of the Century, though subtle distinctions separated them and included differing grilles and taillight lenses. The same 'Colonnade' pillared hardtop roofline and greenhouse were shared with the Grand Prix, Monte Carlo, Cutlass Supreme, and the lower-priced Buick Century Luxus coupe. The newly fashionable opera windows were also featured in the Buick Regal rather than the traditional roll-down windows. A new four-door Colonnade sedan was debuted in 1974 until 1977, while the Colonnade hardtop coupe was featured in the Regal line in 1973.
More often, Regal interiors were found to be much more luxurious than lesser Century models and featured wood-grain trim on both dashboard and door panels, and notchback bench seats with center armrests with velour, cloth or vinyl upholstery, and door-pull straps. A 60-40 split bench seat with armrest was featured as an available option, and for 1976 and 1977 the coupe showcased the S/R option with included reclining bucket seats with corduroy upholstery