This is an Original GM Open Element Air Cleaner Base for the following: 1966 and 1967 Chevelle 396 with High Performance w/o A.I.R., 1967 Camaro 396 High Performance w/o A.I.R., 1967 Impala, Caprice, and Bel Air with 427 Special High Performance w/o A.I.R.,1968 Chevelle 396 High Performance w/automatic, 1968 Chevy II and Camaro with 396, 1968 Impala, Caprice, and Bel Air with 427 Special High Performance, 1969 Chevelle 396 4 Barrell Carb, with Hi Performance, 1969 Camaro 396 4 Barrell Carb w/o Special Duct Hood, 1969 Camaro 302 2nd design w/o Special Duct Hood, 1969 Chevy II Nova 396, and 1969 Impala, Caprice, Bel Air 427 Hi Performance. Note: Dimensions are Diameter 14" Height 2.5" Base to Carb Flange 2" Carb Opening 5". See Pictures