The Ferrari 328 GTB high beam and low beam headlight bulbs both utilize the H6024 size. The replacement chart covers 1986 to 1989 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ferrari 328 GTB uses the H6024 bulb type across all documented model years (1986-1989) for both high beam and low beam headlight positions.
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 a 7-inch round form factor, a standardized size that was regulated under North American lighting standards for the US and Canadian markets.
The H6024 operates at 12 volts, consistent with the standard automotive electrical systems of that era.
Because the 328 GTB uses the same H6024 unit for both high and low beam functions, the vehicle does not use separate bulb types for each lighting mode. Both functions are handled within the sealed beam assembly itself, which contains dual filaments.
The H6024 designation is an ANSI standard code, meaning units from different manufacturers carrying the same designation are expected to conform to the same electrical and physical specifications, which generally allows interchangeability between compliant products.