The Maserati Spyder high beam headlight uses an H4651 bulb size, while low beam headlights require either H4656 or H4652 bulb sizes. The replacement chart covers 1986 through 1991 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 H4651 and H4656 are ANSI-standardized sealed beam units used across North American markets, each housed in a 4x6-inch rectangular format and operating at 12V. Because the light source is fused within the lens and reflector assembly, the entire unit requires replacement rather than an internal bulb swap.
The Maserati Spyder uses the H4651 for high beam and the H4656 for low beam across the 1987-1991 model years, with both types sharing the same physical sealed beam format despite serving distinct lighting functions.
The H4652, a variant of the H4651, served as the low beam unit specifically on the 1986 Maserati Spyder. From 1987 onward, the low beam specification shifted to the H4656, making the 1986 model year distinct in its low beam fitment.
Although the H4651, H4652, and H4656 share the same 4x6-inch rectangular sealed beam construction and 12V rating, they are not interchangeable. Each carries a distinct ANSI designation that corresponds to a specific beam pattern and light output configuration, and substituting one for another would not satisfy the original fitment specification.