Subaru Standard Dome Light Bulb Size

The Subaru Standard dome light utilizes bulb sizes DE3175, 67, and 257 depending on the specific version of the vehicle. Data for the lighting components covers the period from 1980 through 1987.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1985-1987	DE3175
1982-1984	67
1980-1981	257

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 8W.	67
ANSI standard (US & Canada). Festoon or BA9s base instrument bulb. 12V, 2W.	257

Other Locations

Additional Notes

The Subaru Standard uses three distinct dome light bulb types across its 1980-1987 model years: the DE3175, the 67, and the 257.
The DE3175 is a festoon-style bulb with a 31mm length and end-cap contacts, operating at 12V. It fits the Subaru Standard for the 1985-1987 model years.
Festoon bulbs make contact at both ends of the bulb body rather than through a base, which means socket compatibility depends on the length of the bulb as well as the contact style.
The bulb 67 is a single-filament type with a BA15s bayonet base, rated at 12V and 8W. It is specified for the 1982-1984 Subaru Standard dome light.
The BA15s bayonet base uses a single locating pin, distinguishing it from the dual-pin BA15d base. Substituting a dual-pin festoon or bayonet bulb in a BA15s socket would result in an incompatible fit.
The 67 bulb is a lower wattage variant of the 1156, sharing the same BA15s base but drawing significantly less power. The two are not interchangeable despite the shared base type, as wattage and application differ.
The 257 is rated at 12V and 2W, making it the lowest-wattage bulb among the three types listed. It is specified for the 1980-1981 Subaru Standard.
The 257 is noted as either a festoon or BA9s base bulb. The BA9s is a miniature bayonet base, and the two contact configurations are not interchangeable with each other or with the BA15s base used by the 67.
All three bulb types conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical specifications within those markets.
The dome light socket type on the Subaru Standard changed across the 1980-1987 production span, with each of the three bulb types requiring a physically distinct socket, making direct substitution across model year groups incompatible without socket modification.