The Maserati 430i high beam headlight uses an H4651 bulb size, while low beam headlight applications require either H4652 or H4656 bulb sizes for proper illumination. The replacement chart covers 1989 to 1990 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 H4651, H4652, and H4656 are all ANSI-standardized sealed beam units used in North American markets, operating at 12V. Each conforms to the 4x6-inch rectangular sealed beam format, meaning the lens, reflector, and filament are fused into a single glass housing rather than housing a separate replaceable bulb.
Because these are sealed beam units, the entire assembly requires replacement when the light fails. There is no internal bulb that can be removed independently from the housing.
The Maserati 430i uses the H4651 for the high beam headlight position across both the 1989-1990 model years, indicating no change in that specification during this period.
The low beam headlight position shows a specification difference between model years. The 1990 model year uses the H4652, while the 1989 model year uses the H4656. These are distinct part numbers and are not interchangeable without confirming fitment.
The H4652 is a variant of the H4651 within the same 4x6-inch rectangular sealed beam family. Despite their shared physical format, the H4651 and H4652 serve different beam functions and occupy different headlight positions on the 1990 model year vehicle.
The H4651 and H4656 share the same ANSI-standard 4x6-inch rectangular sealed beam format but carry different designations, reflecting differences in filament configuration or light output characteristics that correspond to their respective beam roles.