BMW X3 Series E83 E83N LCI Seal Inner Left Mirror Triangle N/S 3400323

BMW X3 Series E83 E83N LCI Seal Inner Left Mirror Triangle is a precisely fitted component from the Doors and door panels group, responsible for the seal and stable mounting of the driver's side mirror. Thanks to its factory shape and correct geometry, it ensures proper adhesion to the door skin and limits the penetration of noise and moisture into the vehicle's interior.

Specifications and technical data

• SKU: 3400323
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 3400323
• Substitutable numbers: 3400323, 51163400323
• Location on the vehicle: Left
• Category: Doors & Door Skins

Purpose and function of the component

The presented triangle with a foam seal is designed for installation on the left side of the vehicle, in the area where the side mirror is mounted. It is responsible for properly sealing the connection between the mirror and the door, which is important for both acoustic comfort and protection against water and dirt.

This component stabilizes the mirror housing relative to the door structure, reducing unwanted vibrations and minimizing the risk of creaking or resonance when driving at higher speeds.

Benefits of using an original BMW component

Choosing a triangle with a foam seal dedicated to the BMW X3 E83 allows you to maintain the factory fit within the door and mirror area. The properly shaped foam ensures:

• better adhesion to the door sheet metal surfaces,
• reduction of wind noise in the mirror area,
• increased protection against moisture ingress into the mounting zone,
• stable support for the mirror structure.

As a result, you restore the original functional properties of the driver's side door, which translates into more comfortable and predictable vehicle operation.

Installation characteristics

The component has been designed as a body part from the Doors and door panels group, which facilitates its integration with the factory mirror mount in the BMW X3 E83. The design of the triangle and foam is adapted to the geometry of the door on the left side, so the installation is straightforward and does not require any interference with the structure of the bodywork.

The product is in used condition, which in practice means it comes from disassembly and may show signs of wear, but it retains the functionality necessary for further use. This solution allows for an economical repair of the mirror area while maintaining compliance with the factory design.

Use in body repairs

The triangle with a foam seal is particularly useful in situations where the mirror has been damaged, the door has been replaced, or there has been interference in the mounting area on the driver's side. Replacing this component is recommended when:

• the sealing foam is deformed or perished,
• there are leaks and increased noise in the mirror area,
• mirror vibrations occur due to a lack of proper support.

Selecting the right component from this group allows you to restore the proper operating conditions of the mirror as well as the aesthetics of the connection with the door skin.

Expanding repairs within the BMW door area

If you are planning a comprehensive repair or upgrade of the door area in your BMW and need other components from the same group, such as skins, reinforcements, or additional panels, check out the available parts in the BMW Doors and door panels category.

Expert support when choosing used components

When selecting used body parts, just as with mechanical components, it is worth relying on proven procedures and reliable technical knowledge. To better understand the specifics of the second-hand parts market, the verification process based on manufacturer markings, and the real cost differences compared to new components, check out our guide Why it is worth buying used gearboxes and engines – facts instead of myths.