Peterbilt 265 Headlight Bulb Size

Peterbilt 265 headlight bulbs utilize H6054, 9004, and H4651 sizes for high beam applications and H6054, 9004, and H4656 sizes for low beam applications. The replacement chart covers 1988 to 1994 model 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.

High Beam Headlight

Years	Bulb Size
1988-1994	H6054 (With 2 Rectangular Headlamps)
	H4651 (With 4 Rectangular Headlamps)
	H5001 (With 4 Round Headlamps)
	9004 (With Halogen Capsule Headlamps)

Low Beam Headlight

Years	Bulb Size
1994	H6054 (With 2 Rectangular Headlamps)
	H4656 (With 4 Rectangular Headlamps)
	H5006 (With 4 Round Headlamps)
	9004 (With Halogen Capsule Headlamps)
1993	H6054 (With 2 Rectangular Headlamps)
	H4652 (With 4 Rectangular Headlamps)
	H5006 (With 4 Round Headlamps)
	9004 (With Halogen Capsule Headlamps)
1991-1992	H6054 (With 2 Rectangular Headlamps)
	H4656 (With 4 Rectangular Headlamps)
	H5006 (With 4 Round Headlamps)
	9004 (With Halogen Capsule Headlamps)
1989-1990	H6054 (With 2 Rectangular Headlamps)
	H4652 (With 4 Rectangular Headlamps)
	H5006 (With 4 Round Headlamps)
	9004 (With Halogen Capsule Headlamps)
1988	H6054 (With 2 Rectangular Headlamps)
	H4656 (With 4 Rectangular Headlamps)
	H5006 (With 4 Round Headlamps)
	9004 (With Halogen Capsule Headlamps)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). 5x7-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6054
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4651
ANSI standard (US & Canada). 4-inch square sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5001
ANSI standard (US & Canada). Dual-filament halogen bulb with P29t base. 12V, 65W/45W.	9004
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4656
ANSI standard (US & Canada). 5.75-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5006
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit, variant of H4651. Not a replaceable bulb — the entire unit is replaced. 12V.	H4652

Other Locations

Additional Notes

The Peterbilt 265 (1988-1994) accommodates four distinct headlamp configurations across its model range: two rectangular headlamps, halogen capsule headlamps, four rectangular headlamps, and four round headlamps. Each configuration requires a specific set of bulb sizes for high and low beam functions.
The H6054 is a 5x7-inch rectangular sealed beam unit operating at 12V and conforming to ANSI standards for the US and Canadian markets. It serves as both the high beam and low beam bulb in the two-rectangular-headlamp configuration, meaning a single bulb type covers both functions on that fitment.
The 9004 is the only non-sealed-beam bulb type in these specifications. It is a dual-filament halogen bulb rated at 12V with outputs of 65W on high beam and 45W on low beam, using a P29t base. Its dual-filament design allows one bulb to handle both high and low beam duties in the halogen capsule headlamp configuration.
Sealed beam units such as the H4651, H4652, H4656, H5001, and H5006 are not serviceable at the bulb level. When a sealed beam fails, the entire unit requires replacement, as the lens, reflector, and filament are manufactured as a single assembly.
The four-rectangular-headlamp configuration uses different bulb sizes for high and low beams. The H4651 handles high beam duty, while the low beam position is filled by either the H4656 or H4652 depending on the model year, both of which are 4x6-inch rectangular sealed beam units operating at 12V.
The H4652 is specified as a variant of the H4651 within the 4x6-inch rectangular sealed beam family. Despite their shared physical format, the two are not listed interchangeably within the same model year, and substituting one for the other without confirming fitment compatibility is not supported by these specifications.
The four-round-headlamp configuration uses the H5001 for high beam and the H5006 for low beam across all years covered. The H5001 is a 4-inch square sealed beam unit, while the H5006 is a 5.75-inch round sealed beam unit, reflecting a difference in physical size between the high and low beam positions in that configuration.
All bulb types listed across both high and low beam positions operate at 12V and conform to ANSI standards applicable in the US and Canada, indicating a consistent electrical system voltage requirement throughout the Peterbilt 265 headlamp specifications for the 1988-1994 period.