Subaru Brat Headlight Bulb Size

Subaru Brat headlight bulbs utilize H4651, H6054, and H5001 sizes for high beam applications and H4656, H4652, and H6054 sizes for low beam configurations, with the bulb size varying across production variants. The replacement chart covers 1978 through 1987 model 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.

High Beam Headlight

Years	Bulb Type	Shop
1982-1987	H4651	Check Price
1980-1981	H6054	Check Price
1978-1979	H5001	Check Price

Low Beam Headlight

Years	Bulb Type	Shop
1987	H4656	Check Price
1986	H4652	Check Price
1984-1985	H4656	Check Price
1982-1983	H4652	Check Price
1980-1981	H6054	Check Price
1978-1979	H5006	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4651	Check Price
ANSI standard (US & Canada). 5x7-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6054	Check Price
ANSI standard (US & Canada). 4-inch square sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5001	Check Price
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4656	Check Price
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit, variant of H4651. Not a replaceable bulb — the entire unit is replaced. 12V.	H4652	Check Price
ANSI standard (US & Canada). 5.75-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5006	Check Price

Other Locations

Additional Notes

All headlight positions across all model years of the Subaru Brat use sealed beam units, meaning the entire housing assembly is replaced rather than an individual bulb.
Every sealed beam type specified for the Subaru Brat operates at 12V and conforms to ANSI standards recognized in both the United States and Canada.
The H4651 is a 4x6-inch rectangular sealed beam unit used for the high beam position across the 1982-1987 model years, making it the most consistently specified bulb type in these specifications.
The low beam position across the 1982-1987 model years is split between two 4x6-inch rectangular sealed beam variants: the H4656 and the H4652. The H4652 is described as a variant of the H4651, indicating a close functional relationship between the two types despite their different part designations.
The 1981-1982 high beam and low beam positions share the same H6054 unit, a 5x7-inch rectangular sealed beam. This is the only configuration in these specifications where a single part number covers both beam positions in the same year.
The 1978-1979 model years use two distinct sealed beam formats: the H5001, a 4-inch square unit for the high beam, and the H5006, a 5.75-inch round unit for the low beam. These two formats differ not only in size but also in shape, which affects physical interchangeability.
Because sealed beam units are shape-specific and standardized by ANSI, substituting a unit of a different size or shape is not supported by the specifications, even when voltage ratings match.