The Cadillac Series 61 headlight bulb uses an H6006 size for both high beam and low beam applications. The replacement chart covers 1950 to 1951 vehicle production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H6006 is the sole bulb type listed across all headlight positions for the Cadillac Series 61, covering both the 1950-1951 model years.
The H6006 is a 5x7-inch rectangular sealed beam unit operating at 12 volts, conforming to ANSI standards recognized in both the United States and Canada.
A sealed beam unit integrates the filament, reflector, and lens into a single non-serviceable assembly, meaning the entire unit is replaced rather than an internal bulb component.
The H6006 specification applies identically to both the high beam and low beam headlight positions, indicating the Series 61 used a dual-function or interchangeable sealed beam arrangement across those roles.