The Porsche 914 front and rear side marker bulbs utilize a 3893 size across both positions. The replacement chart covers 1970 to 1976 production 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.
The Porsche 914 uses the 3893 bulb for both front and rear side markers across the entire 1970-1976 production run.
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.
The 3893 operates on a 12-volt electrical system, consistent with the standard automotive voltage found in the 914.
As a dual-filament bulb, the 3893 contains two separate filaments within a single envelope, allowing it to serve more than one lighting function from a single housing.
The 3893 uses a BAY15d bayonet base, which is an offset twin-pin base. The offset pin placement prevents incorrect installation by ensuring the bulb can only be seated in one orientation.
The BAY15d base is classified as a specialty application fitting, distinguishing it from more common single-filament bayonet bases used in general automotive lighting.
Because the same bulb number applies to both the front and rear side marker positions on the Porsche 914, the 3893 is interchangeable between those two locations on the vehicle.
The uniformity of the 3893 specification across all model years of the 914 indicates no bulb substitution or revision was introduced at any point during the production span covered by these specifications.