Hino FFC1 high beam headlight bulbs use H4651 size while low beam headlight bulbs use H4656 size. The replacement chart covers 1987 to 1988 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 Hino FFC1 uses H4651 bulbs for high beam and H4656 bulbs for low beam across the 1987-1988 model years.
Both the H4651 and H4656 are sealed beam units conforming to ANSI standards recognized in the United States and Canada.
Each sealed beam unit follows the 4x6-inch rectangular format, a standardized size that allows physical interchangeability across many vehicles using the same format.
Despite sharing the same physical housing size and shape, the H4651 and H4656 are not interchangeable with each other, as they serve distinct beam functions with different internal optical configurations.
Both units operate on a 12V electrical system, which is standard for light-duty and medium-duty commercial vehicles of this type.
Because both types are sealed beam units, the entire lamp assembly is replaced when the light fails, rather than an internal filament or capsule bulb.