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The 1961 La Salle concept was also known as XP-715, following the General Motors custom of assigning 'experimental' cars XP numbers. The Buick Riviera was introduced to the public on October 4, 1962, and immediately the Riviera received approval as the most brilliant automobile to appear in years. Automotive writers praised the car for its style, engineering, and handling. Unlike most of the new models, the Riviera had its beginning in the styling studio, with little thought given to engineering considerations. It wasn't until Buick was awarded the car did they have to work out all of the mechanical problems without altering the shape.
It should be said that the idea for a new personal luxury car at GM was most likely influenced by the success of Ford's four-seat Thunderbird, which was introduced in 1958. The new Thunderbird proved to be such a phenomenal success that GM president John E. Gordon realized the need for GM to have something to compete. He looked to his styling studio and his new chief stylist, William L. Mitchell, for ideas. Mitchell, trained under Harley Earl, had a talented staff of designers, including Ned Nickles, who had created the 1949 Roadmaster Riviera, Buick's first pillarless hardtop.
GM had already been working unofficially on a car they believed would blow the feathers off the bird. According to Nickles, he had sketches of a vehicle that he made in his apartment, which he envisioned as being a Cadillac LaSalle II. There seemed to be no interest in the project until Mitchell showed the concept to Buick's new General Manager, Ed Rollert. In 1959, while the preliminary design work was ongoing, Mitchell attended the London Auto Show. There, it is told by Mitchell himself that one evening on a foggy London street, he was impressed by the silhouette of a Rolls Royce, with its sharp lines and angles, which was partially obscured in the mist. He recalls thinking, "That's it, but the car would look much better if it were lower. He then knew the look he wanted to achieve with the new project. Upon his return, Ned Nickles and his staff modified the original sketches to include the razor-sharp roof and sides. The new project was assigned experimental project number XP-715, and by August 1960, they had a full-sized mockup bearing LaSalle II nameplates.
The preliminary drawings featured subdued or hidden headlights concealed behind the fender grilles. Many solutions for headlight placement were tried. Some were awful. The original plan to put the headlights behind the fender grilles could not be engineered in time, and the headlights were placed in the grille. The early grille designs varied; some even had a solid front without a grille and air intake below the front bumper. Due to Mitchell's influence, nonfunctional dual scoops were added to the side panels. This was one of the first cars, along with the Pontiac Grand Prix, that broke away from the excessive use of chrome.
Although the car was initially designed as a Cadillac, John Gordon, GM's president, allowed all divisions to compete when the design was complete. As it turned out, Chevrolet and Cadillac were doing so well they didn't need another model, whereas Buick, Oldsmobile, and Pontiac were very interested. Buick's sales were way down, and this new model was just what they needed. In April 1961, after an energetic presentation and a promise not to change the design, they were presented with the XP-715. However, the car was still without a name. After dismissing such names as "Centurion" and "Drake," they chose "Riviera," which evoked the elegance of the Italian and French coastline. The name was not new to Buick, as they had used it since 1949 to describe their early pillarless models; however, this would be the first time the name would appear on an exclusively designed model.
Source: Ray Knott - The Review Vol. 18, No. 1 Nov. Dec. 2001
Images: GM; rivowners.org
