What tail light bulb for 2002 BMW x5?

For a 2002 BMW X5, the tail light bulb typically used is the 21W (also known as the P21W) bulb for the brake and tail lights. However, it's always best to check your vehicle's owner's manual or consult with an auto parts store to confirm the specific bulb numbers, as variations may exist based on the vehicle's production date and options.