Triumph Spitfire headlight bulbs utilize the H6024 size for both high and low beam functions. The replacement chart covers vehicle production spanning 1973 to 1980.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H6024 is the sole bulb type listed across all headlight positions in the Triumph Spitfire specifications, covering both high beam and low beam functions for the 1973-1980 model years.
The H6024 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 requires replacement rather than an internal bulb swap.
The H6024 unit follows the 7-inch round sealed beam format, a standardized size that was regulated for use in North American markets under ANSI specifications applicable to the United States and Canada.
The Triumph Spitfire uses the same H6024 unit for both high beam and low beam functions, indicating the vehicle relies on a dual-filament sealed beam design rather than separate single-filament units for each beam mode.
The H6024 operates on a 12-volt electrical system, consistent with the 12V architecture standard in passenger vehicles of that era.
Because the H6024 is an ANSI-standardized format, fitment is governed by the physical and electrical standards of that specification rather than being proprietary to a single manufacturer, allowing units from multiple suppliers to be interchangeable provided they conform to the H6024 standard.