Original BMW Tail Light Bulb Socket for BMW 318i, 325i, 328i, M3, 740i, 740iL, 750iL, and X5 (1992–2004)

Sold individually, this Original BMW bulb socket, part 63-21-1-387-365, holds a bulb in the tail light assembly and carries current to it on the 1992–2004 BMW 318i, 325i, 328i, M3, 740i, 740iL, 750iL, and X5. BMW calls it simply the bulb socket and finishes it in black. The socket clips the bulb into the lamp housing and connects it through metal contacts. Over time those contacts can corrode, and once they do the bulb no longer gets the conductivity it needs to light. A fresh socket restores clean contact for the bulb. It weighs 11 grams and is made in Germany.

Original BMW Parts carry a 24-month parts warranty.

BMW put this one socket into production in November 1990, and it carries across three different chassis. It appears on the E36 3 Series, the E38 7 Series, and the E53 X5, which is why the same number covers cars as different as a 318i and an X5 4.6is. When corrosion shows on the contacts of a socket in your tail light, this is the part BMW uses to replace it. Count the sockets you need before ordering, since each is sold on its own.

Technical Details

• Manufacturer: BMW (Genuine BMW)
• Part number: 63-21-1-387-365
• BMW name: bulb socket
• Color: black
• Weight: 11 g (0.39 oz)
• Production start: November 1990
• Made in Germany
• Priced and sold individually
• Warranty: 24 months on Original BMW Parts

Common Questions

Why did my tail light bulb stop working when the bulb tests fine?
The metal conductors in the socket can corrode, which keeps the bulb from getting proper conductivity. Replacing the socket restores the connection.

Is this socket sold in a set?
No. It is priced and sold individually.

PMB Performance carries Genuine BMW lighting parts for E36, E38, and E53 owners.

Fitment & Compatibility

Use the fitment table below to confirm the exact year, make, model, submodel, and any application notes before ordering. PMB Performance can confirm this against your VIN, backed by more than 20 years of parts and fitment work.