Harley-Davidson FX Super Glide Headlight Bulb Size
Harley-Davidson FX Super Glide headlight bulbs utilize the H5006 size for both high and low beam functions. The replacement chart covers 1971 through 1978 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 H5006 is an ANSI-standardized sealed beam unit, meaning the lens, reflector, and filament are fused into a single non-serviceable assembly. When the filament fails, the entire unit is replaced rather than an individual bulb.
The H5006 operates on a 12-volt electrical system and measures 5.75 inches in round form, conforming to a standardized size recognized across the US and Canadian markets.
The Harley-Davidson FX Super Glide uses the H5006 for both the high beam and low beam headlight positions across the 1971-1978 model years, meaning a single sealed beam unit serves both lighting functions.
Because the H5006 is a sealed beam type rather than a bulb-in-housing design, fitment is determined by the physical size and connector of the unit rather than by a separate bulb socket, which affects how replacements are sourced and installed.
The ANSI standardization of the H5006 means the unit conforms to a defined specification shared across multiple vehicle manufacturers, though physical interchangeability with non-motorcycle applications depends on the mounting hardware and connector configuration of the receiving vehicle.