The Harley-Davidson FLHB uses an H5006 bulb size for both high beam and low beam headlight applications. The replacement chart covers 1965 to 1969 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 H5006 is an ANSI-standardized sealed beam unit used in both the high beam and low beam headlight positions of the Harley-Davidson FLHB across the 1965-1969 model years.
As a sealed beam unit, the H5006 does not contain a replaceable bulb element. The entire assembly is replaced as a single unit when the light fails or is damaged.
The H5006 operates on a 12-volt electrical system and is produced to ANSI standards recognized in both the United States and Canada.
The sealed beam housing of the H5006 measures 5.75 inches in round form, which is a standardized size shared across many vehicle applications of that era, meaning cross-compatible units from other manufacturers may fit the same socket.
Because the H5006 serves both the high beam and low beam positions on the Harley-Davidson FLHB, both functions are housed within a single sealed beam unit rather than separate bulbs for each function.