 The similarly styled Chevrolet still used the radically different "X" frame in the early 1960s.A complete departure in 1961, though, was the new Tempest, one of the three Buick-Olds-Pontiac (BOP) "compacts" introduced that year, the others being the Buick Special and Skylark and Oldsmobile F-85 and Cutlass.Toward the end of the 1961 model year, an upscale version of the Tempest called the LeMans was introduced, named after the famous 24 Hours of Le Mans auto race in France.