Xenon bulb D1S. Made by Osram/Sylvania OEM. Sold each.
Part# 63 21 7 217 509.
Buyers Note: Xenon bulbs do "wear" over time; When replacing just 1 bulb at a time you will notice that the color of light will not match your old bulb.
Cross References: 63217217509 63-21-7-217-509 39663 D1S 30763954 99963103590 93169040 N10566103 910139000002 N10566101 84920-XA030 8395A044 1772 63217217509 P8014-403184