Avec standard 5 3/4 Round 36W LED Headlight Conversion - Single Piece Premium Headlights Upgrade 4000 4040 5506 H5006 Single Headlight with clear glass lense 5 3/4 inch round size that fits all cars with round sealed beam headlights with diameter 5.75 inches. This headlamp assembly replaces your 5- 3/4 in round sealed beam unit with these high quality aftermarket lights. This makes swapping in new headlamps much easier, as you only need to replace the bulbs, not the entire headlamp! These bulbs use H4 bulbs (also known as 9003) that are not included Some Vehicles these headlights may fit (Please note some vehicles you may need slight fitment adjustment) Quality you can see! Euro Clear Lens Real Glass Lens Multi Surface Reflector provide a more uniform, controlled, precisely focused beams resulting in brighter and even illumination on the road. Metal reflector Plug and Play - Installs like the factory headlight Removable Bulb - H4 Not included 50% More Powerful than regular headlights Buick Electra 1974-1975 Buick Lesabre 1975 Buick Riviera 1963-1974 Buick Skylark 1962-1972 Cadillac Eldorado 1973-1974 Cadillac All 1958-1972 Chevy Corvette 1960-1980 Chevy Caprice 1974-1976 Chevy Impala 1974-1976 Chevy Belair 1974-1975 Chevy 1960-1973 Chevy Chevelle 1965-1970 Chevy Corvair 1960-1969 Chevy All 1958-1959 Pontiac Firebird