SUPER NICE INSIDE DOME LIGHT ASSEMBLY, FITS MANY 55 TO 60 CHEVYS ALL EXCEPT 55 HARDTOPS AND ALL NOMADS AND SOME IMPALAS, COMES COMPLETE WITH NEW WHITE SMOOTH LENS, BULB, WIRING AND NEW CHROME BEZEL, THIS LIGHT SITS IN THE CENTER OF THE HEADLINER.IT IS 5 INCHES IN DIAMENTER, SOME IMPALAS USED THE TWO SMALLER ONES ONE EACH SIDE