Ford Mainline headlight bulbs utilize H6024 and H6006 bulb sizes for both high and low beam applications. The replacement chart covers 1952 through 1956 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 Ford Mainline uses two sealed beam unit types across its model years: the H6006 for 1952-1955 and the H6024 for 1956.
Both the H6006 and H6024 are sealed beam units, meaning the entire assembly is replaced rather than an internal filament or capsule.
The H6006 is a 5x7-inch rectangular sealed beam unit operating at 12V and conforming to ANSI standards recognized in both the United States and Canada.
The H6024 is a 7-inch round sealed beam unit operating at 12V, also built to ANSI standards for the United States and Canada markets.
On the Ford Mainline, the high beam and low beam functions share the same bulb type for each model year, with the H6006 serving both functions from 1952-1955 and the H6024 serving both functions in 1956.
The H6006 and H6024 differ in physical form, one being rectangular and the other round, which makes them non-interchangeable despite sharing the same voltage rating.