BMW F31 Door Window Strip Rear Left N/S Seal Trim Outer Channel Alu Matt

BMW F31 Door Window Strip Rear Left N/S Seal Trim Outer Channel Alu Matt is a precisely fitted component from the Doors and door panels group, designed for installation on the rear left side of the vehicle body. The matte finish ensures a consistent, subtle look that matches the factory BMW styling, and the OEM construction guarantees proper adhesion to the window and door edge.

Specifications and technical data

• SKU: 7312909
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7312909
• Substitutable numbers: 51357312909, 7312909, 51354529647, 4529647, BG
• Location on the vehicle: Rear, Left
• Category: Doors & Door Skins

Purpose and function of the window strip

The rear left window strip is responsible for the controlled guidance of the window and limiting the ingress of water and contaminants into the door interior. A correctly selected component helps maintain the tightness of the window system, reduces the risk of fogging, and protects the window lifting mechanism from excessive wear.

The vehicle placement in the Rear, Left zone means that the component is dedicated to a specific mounting position, which facilitates service and eliminates fitment issues characteristic of universal replacements.

Construction, fitment, and installation

The strip has been designed as an original BMW part, ensuring it maintains the correct edge geometry and appropriate profile rigidity. The matte surface blends well with factory seals and window frames, without causing reflections or color differences typical of cheaper replacements.

The component is prepared for installation in place of the factory strip, allowing for plug-and-play service – without the need for bodywork modifications or adjusting mounts. Proper fitment reduces wind noise at higher speeds and minimizes the risk of the strip vibrating while driving.

Benefits of using an original BMW strip

• Factory fitment – maintaining the body lines and proper window guidance in the rear left door.
• Stable operation of the window mechanism thanks to appropriate pressure and guidance of the glass edge.
• Limiting the ingress of water and dirt into the door interior, which promotes a longer service life for internal components.
• Consistent, matte finish that does not disrupt the original aesthetics of the side bodywork.
• A solution consistent with BMW construction, beneficial for accident repairs and body restoration.

Characteristics of the used component

As a used part, the window strip comes from disassembly, which allows for maintaining the original manufacturer's specification while reducing repair costs. Such components are particularly useful when servicing older BMW F31 models, where the availability of new parts can be limited, and maintaining consistency with the factory construction is of great importance for the durability and appearance of the vehicle.

If you have any doubts regarding the cost-effectiveness of using parts from disassembly in older models, it is worth checking our guide: No parts at the dealership? How to deal with repairing older models using parts from disassembly.

Comprehensive door zone repair in BMW

If you are planning a comprehensive repair or upgrade of the door zone in your BMW and need other elements from the same group, such as window seals, door panels, or additional trim strips, check the available parts in the BMW Doors and door panels category.