In 1976, Cadillac had introduced the Eldorado Biarritz, in tribute to the Biarritz models that had become so popular during the mid-1950s and continued into the 1960s. For 1978, the Biarritz option added a convertible-like padded vinyl top, unique script, body chrome moldings, and accent stripes. The Biarritz package included opera lamps, remote-control passenger-side mirror, and color-coordinated wheel discs. A Custom Biarritz Classic option was also available, which added a two-tone paint scheme.

The Cadillac DeVille, for 1973, was the company’s most popular model, with 103,394 examples produced of the sedan. The DeVille was responsible for over 70% of Cadillac’s production. Power was provided from an overhead valve V8 engine displacing 500 cubic-inches and offering 375 horsepower. In many respected, the Deville was a Calais model with more trim, better and more luxurious appointments, rear armrest and standard power seat. 

Cadillac was restyled again for 1963. Exterior changes imparted a bolder and longer look. Hoods and deck lids were redesigned. The front fenders projected 4.625 inches further forward than in 1962 while the tailfins were trimmed down somewhat to provide a lower profile. Body-side sculpturing was entirely eliminated. The slightly V-shaped radiator grille was taller and now incorporated outer extensions that swept below the flush-fender dual headlamps. Smaller circular front parking lamps were mounted in those extensions.