The Hino FF19 high beam headlight uses an H4651 bulb size, while low beam headlight applications require either H4656 or H4652 bulb sizes. The replacement chart covers vehicle production years spanning 1987 to 1991 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 Hino FF19 uses H4651, H4656, and H4652 bulb types across its high beam and low beam headlight positions for the 1987-1991 model years. All three are ANSI-standardized sealed beam units recognized in both the United States and Canada.
All three bulb types share the same 4x6-inch rectangular sealed beam format and operate on 12V. In a sealed beam unit, the lens, reflector, and filament are fused into a single glass assembly, meaning the entire unit is replaced rather than an internal bulb.
The H4652 is a variant of the H4651. Although both occupy the same 4x6-inch rectangular sealed beam form, they are distinct ANSI part numbers and are not confirmed as interchangeable without verification against the specific application.
The high beam position on the Hino FF19 uses the H4651 without variation across all five model years from 1987 to 1991.
The low beam position shows a fitment split: the H4656 is specified for 1987, 1990, and 1991, while the H4652 is specified for 1988 and 1989. Substituting one for the other in the low beam position would not align with the stated specifications.
The H4651 and H4656 share the same physical format and voltage rating but carry different ANSI designations, which typically indicate differences in light output, beam pattern, or filament configuration. They are not listed as interchangeable within these specifications.