BMW 3 E90 E91 Seal Outer Right Mirror Triangle O/S 7139348

BMW 3 E90 E91 Seal Outer Right Mirror Triangle O/S is a precisely fitted component from the Doors and door panels group, responsible for the seal and stable mounting of the right-side mirror at the triangular attachment point. This used, original sealing foam helps limit the ingress of moisture, noise, and vibrations into the door interior, improving vehicle comfort.

Specifications and technical data

• SKU: 7139348
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7139348
• Substitutable numbers: 51337139348, 7139348
• Location on the vehicle: Right
• Category: Doors & Door Skins

Purpose and technical function

The triangular foam seal operates in a critical area where the mirror connects to the door skin on the right side of the vehicle. Its purpose is to:

• limit the penetration of water and moisture into the door interior,
• dampen vibrations generated by the mirror while driving,
• reduce wind noise in the area of the pillar and mirror,
• stabilize the contact point between the mirror base and the door panel.

Thanks to its proper fit to the BMW door construction and the appropriate foam profile, this component supports the maintenance of the correct mirror mounting geometry and helps maintain a seal around the triangular panel.

Compatibility and fit for BMW

The offered seal has been designed specifically for the BMW E90 series door construction, which translates into a proper fit with the factory right-side mirror mount. This means that:

• the shape of the foam corresponds to the geometry of the triangular mirror mount,
• the thickness and material structure are adapted to the factory gap between the mirror and the door panel,
• installation does not require any modifications to the door skin or the mirror base.

Such a fit is particularly important when replacing a mirror or performing repairs within the door area, where maintaining factory sealing and the correct positioning of elements affects the durability of the entire assembly.

Material characteristics and benefits of use

The foam structure of the seal ensures a flexible fit to the surface of the door panel and the mirror base, compensating for minor irregularities and minimal deformations resulting from vehicle use. Using this component allows you to:

• reduce the risk of unwanted rattling and resonance in the mirror area,
• limit the possibility of water accumulation in the mounting zone,
• maintain a more stable position of the mirror relative to the door.

For the user, this means more predictable mirror behavior at higher speeds and better protection of internal door components against the long-term effects of moisture.

Application in door and mirror repairs

This element is particularly useful during:

• replacement of the right exterior mirror after a collision or mechanical damage,
• regeneration of the passenger-side door,
• elimination of leaks and noise in the area of the triangular mirror mount.

Using an original foam seal from the Doors and door panels group allows you to maintain the structural integrity of the door assembly, which is important both from the point of view of driving comfort and the long-term durability of body components.

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

Condition and origin

The seal comes from a dismantled BMW vehicle, which means it is a component structurally compatible with the manufacturer's factory solutions. This type of part is a good choice for vehicle maintenance when you want to maintain the original mirror mounting geometry and ensure proper cooperation with other door components.

Summary

BMW 3 E90 E91 Seal Outer Right Mirror Triangle O/S is a practical mounting and sealing element designed to work in the demanding area where the mirror connects to the door on the right side. The properly selected foam shape, fit to the BMW construction, and the function of dampening vibrations and limiting moisture make it a beneficial solution for repairs and replacements within the door and mirror area.

If you are interested in the broader context of using recycled body components and want to better plan economical repairs using dismantled parts, it is worth reading the guide: Used car parts – a way for style and savings.