Porsche 912 License Plate Bulb Size

The Porsche 912 license plate light requires a 3893 bulb size for proper illumination of the rear registration area. Data for the specified component covers the range from 1965 to 1976.

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
1976	3893
1965-1969	3893

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, specialty application. 12V.	3893

Other Locations

Additional Notes

The Porsche 912 uses the 3893 bulb for its license plate lighting across all listed model years, spanning 1965-1976.
The 3893 is an ANSI-standardized bulb, meaning it conforms to a defined set of electrical and physical specifications recognized across the United States and Canada.
This bulb operates on a 12-volt electrical system, which is standard for automotive applications of this era.
The 3893 features a dual-filament design, meaning it contains two separate filaments within a single bulb envelope, each capable of operating independently.
It uses a BAY15d bayonet base, a two-pin offset bayonet mount where the two pins are positioned at different heights to ensure the bulb can only be seated in one orientation, preventing incorrect installation.
The BAY15d base is classified as a specialty application fitting, indicating it is not among the most universally common automotive bases and may require attention when sourcing a replacement.
Because the 3893 carries a specific base type and pin offset configuration, substituting it with a visually similar bayonet bulb that lacks the offset pin arrangement would result in an incompatible fit.