The BMW 750iL front and rear side marker bulb sizes include 2357NA, P21/5W, 12961, and 12821 specifications for this model. The replacement chart covers 1988 to 2001 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The BMW 750iL front side marker uses three distinct bulb types across its production span: the 12961 for 1988-1994, the P21/5W for 1995-1998, and the 2357NA for 1999-2001.
The rear side marker on the BMW 750iL similarly cycles through three bulb types: the 12961 for 1988-1994, the 12821 for 1995-1998, and the P21/5W for 1999-2001.
The 2357NA is an ANSI-standard dual-filament bulb rated at 12V with a high/low wattage split of 26.9W and 8W, mounted on a BAY15d bayonet base. Its natural amber glass produces the amber color required for side marker functions without the need for a tinted lens.
The P21/5W follows the ECE standard used in European and worldwide markets. It is also a dual-filament bulb on a BAY15d bayonet base, rated at 12V with filaments drawing 21W and 5W respectively.
Both the 2357NA and P21/5W share the BAY15d bayonet base, yet they are not interchangeable. Their wattage ratings differ substantially, and the 2357NA carries integral amber glass that the P21/5W does not.
The 12961 and 12821 are both Philips miniature wedge bulbs in the T10 form factor, each using a W2.1x9.5d base and rated at 12V, 5W. Despite sharing identical electrical and physical characteristics, they carry separate part numbers and are listed for different positions on the 750iL.
Because the 12961 and 12821 share the same base type, voltage, and wattage, a direct physical fit is possible in either socket, though substitution should be confirmed against the specific position requirements before installation.
The dual-filament design of both the 2357NA and P21/5W allows a single bulb to serve two brightness levels, which is relevant in side marker applications where parking and signaling functions may draw on separate filaments.
The front and rear side markers on the 750iL do not always use the same bulb within a given model year. For 1995-1998, the front position calls for a P21/5W while the rear uses a 12821, reflecting different optical or housing requirements between the two locations.
For 1999-2001, the front and rear side marker positions swap their bulb assignments relative to the prior generation: the front moves to the 2357NA while the rear adopts the P21/5W.