P21W halogen bulb with BA15s base — two per pack, so both sides get replaced at once.
The OSRAM Standard P21W car bulb is a classic 12 V signal lamp rated at 21 W with a bayonet BA15s base. It fits brake lights, indicators, rear fog lamps and reversing lights on cars and light commercial vehicles, and comes two to a pack.
BA15s base for a direct swap
The single-contact bayonet fitting twists and locks into the holder without tools. Clear glass and a metal base match the factory-fit specification for P21W positions.
Two bulbs per pack for symmetrical replacement
Left and right positions are best replaced together so brightness stays even and the second bulb does not fail shortly after the first. One pack covers both sides of the car.
For 12 V vehicle signal lighting
The P21W position appears in brake lights, indicators, rear fog lamps and reversing lights. Check the marking in the vehicle handbook or on the old bulb before buying.