The BMW Bavaria front and rear side marker bulb size is 3893, a standardized bulb specification for this model. The replacement chart covers vehicle production years spanning 1972 to 1974.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The BMW Bavaria uses the 3893 bulb across both its front and rear side marker positions for the 1972-1974 model years.
The 3893 is an ANSI-standardized bulb type, meaning its physical and electrical specifications conform to a defined North American standard recognized in both the United States and Canada.
The 3893 operates on a 12-volt electrical system, which is consistent with standard automotive DC voltage found in most passenger vehicles of that era.
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 is a deliberate design feature that prevents incorrect insertion, ensuring the two filaments are oriented to their correct circuits.
The 3893 is classified as a specialty application bulb, distinguishing it from general-purpose automotive bulbs and indicating it is intended for specific fitment contexts rather than broad interchangeable use.
Because the same bulb number applies to both the front and rear side marker positions on the BMW Bavaria, a single bulb type services all four side marker locations on the vehicle.