The decade of the 1960s saw the creation of compact and intermediate classes. The Chevrolet Corvair was a flat 6-cylinder (air cooled) response to the Volkswagen Beetle, the Chevy II was created to match Ford's conventional Falcon, after sales of the Corvair failed to match its Ford rival, and the Chevrolet Camaro/Pontiac Firebird was GM's countermeasure to the Ford Mustang. Among intermediates, the Oldsmobile Cutlass nameplate became so popular during the 1970s that Oldsmobile applied the Cutlass name to most of its products in the 1980s. By the mid-1960s, most of GM's vehicles were built on a few common "platforms" and in the 1970s GM began to further unify body panel stampings.