BMW 3 Series E90 Left N/S Roller Sun Screen Triangular Window Left N/S 7129811

BMW 3 Series E90 Left N/S Roller Sun Screen Triangular Window Left N/S is an original component from the Car Windows group, designed specifically for installation on the left side of the vehicle body. It provides effective protection against sunlight in the rear cabin area, improving passenger travel comfort and the aesthetics of the side window area in your BMW.

Specifications and technical data

• SKU: 7129811
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7129811
• Substitutable numbers: 51357129811, 7129811, AS
• Location on the vehicle: Left
• Category: Car Glass

Purpose and function in the BMW 3 Series E90

The presented roller sun screen is dedicated to the triangular side window in the BMW 3 Series E90 model on the left side. This element has been developed as part of the factory equipment, ensuring full compatibility with the body lines, guides, and mounts provided by the manufacturer.

The roller screen helps reduce interior heating, minimizes glare, and improves visual comfort for passengers, especially during long journeys. At the same time, it serves as a practical addition to the factory glazing without interfering with the structure of the window itself.

Construction and body fitment

The element has been designed for a precise fit to the shape of the triangular side window in the BMW 3 Series E90. The construction of the roller screen works with factory mounting points, which facilitates installation and ensures stable operation of the mechanism during daily use.

Positioning on the left side of the vehicle guarantees the correct geometry of the screen relative to the window frame, and the appropriately selected shading surface allows for effective light penetration reduction while maintaining visibility to the outside.

Benefits of using an original roller screen

Using an original roller sun screen in the BMW 3 Series E90 brings a number of practical benefits:

• Better thermal comfort – limiting the heating of the rear cabin area on sunny days.
• Protection against glare – reducing annoying light falling on passengers and interior elements.
• Aesthetic integration with the interior – consistent look with other windows and door panel finishes.
• Factory fitment – no need for modifications, drilling, or the use of additional adapters.

Thanks to this, the roller screen is a functional addition to the equipment that improves the daily usability of the vehicle without changing its character or styling.

Characteristics of the used element

The offered roller sun screen is a used part, sourced from dismantling, which allows for maintaining a favorable price-to-quality ratio while preserving the original manufacturer's specifications. Such components are frequently chosen by owners of premium cars who are looking for solutions consistent with the factory standard, while remaining economical.

Choosing a used, original element from the Car Windows group is a sensible alternative to replacements, especially in the case of details responsible for the comfort and ergonomics of vehicle use.

Expanding knowledge and selecting parts

If you are planning a comprehensive repair or upgrade of the side window area in your BMW and need other elements from the same group, such as additional roller screens, seals, or complete glazing, check the available parts in the BMW Car Windows category.

To better understand why original used components for premium brands are currently so frequently chosen, it is worth reading the article Crisis in the new parts market? Why in 2026 used originals for premium cars (BMW, Mercedes, Porsche) are the hottest trend, which discusses the current market situation and the benefits of choosing verified parts from dismantling.