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Starting at $29.95, AutoBuffy stocks 1 headlight bulb caps from URO for the Bmw 440I Gran Coupe. A headlight bulb cap seals the rear opening of the headlight housing, keeping moisture, dirt, and road debris away from the bulb socket. When it cracks, goes missing, or loses its rubber seal, condensation builds inside the lens and can ruin the bulb, socket, and housing.
Headlight bulb caps vary by bulb size, housing design, and material. The most important factor is matching the cap to the specific bulb position — low beam, high beam, and fog lamp openings are often different diameters and are not interchangeable. Material quality matters too: a cheap thin-plastic cap will re-crack quickly; a thick rubber or reinforced cap lasts far longer.
| Option | Best for | What you get |
|---|---|---|
| OEM-match rubber cap | Owners who want a factory-correct fit and seal | Exact diameter, correct thread or twist-lock pattern, flexible rubber that resists cracking from heat cycles |
| Aftermarket universal rubber cap | Budget replacements when the OEM cap is discontinued or overpriced | Lower cost, often sold in multiple sizes; requires careful diameter matching to avoid a loose seal |
| Hard plastic screw-on cap | High-output or HID/LED retrofit bulbs that generate more heat | Rigid construction tolerates higher temperatures; typically includes a rubber gasket ring for the seal |
| Full cap-and-gasket kit | Housings where both the cap and its O-ring seal have failed | Comes with a replacement cap plus the sealing ring so moisture cannot enter around the cap edges |
Access the rear of the headlight housing from the engine bay — on most Bmw 440I Gran Coupe applications no bumper removal is needed. Twist or unclip the old cap counterclockwise, pull it free, seat the new cap and rotate it clockwise until it locks or snaps firmly in place. Confirm the cap sits flush all the way around with no gaps before closing the hood, as even a small gap will allow moisture entry.