The Fiat X-1/9 headlight bulb uses the H6024 size for both high beam and low beam applications. The replacement chart covers vehicle production from 1974 to 1983 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 Fiat X-1/9 uses the H6024 bulb size for both high beam and low beam headlights across all model years from 1974-1983.
The H6024 is an ANSI-standard sealed beam unit recognized in the United States and Canada, operating at 12 volts.
A sealed beam unit integrates the filament, reflector, and lens into a single glass assembly, meaning the entire unit is replaced rather than an internal bulb.
The H6024 follows a 7-inch round form factor, which was a regulated standard for headlighting in North American markets during this period.
Because both the high beam and low beam positions share the same H6024 specification on the Fiat X-1/9, the same sealed beam unit serves both functions across the full 1974-1983 production run.
The H6024 designation is an ANSI code, meaning units from different manufacturers carrying the same code are built to identical dimensional and photometric standards, which allows interchangeability between compliant products.