BMW E87 E90 E91 Front Left Seat N/S Backrest Frame Mechanism Carrier

Description

BMW E87 E90 E91 Front Left Seat N/S Backrest Frame Mechanism Carrier is a base structural component of the driver’s seat, designed for installation in the front left section of BMW 1 and 3 series vehicles. The robust frame provides a stable foundation for the seat cushion, backrest, and adjustment mechanisms, ensuring proper support and secure attachment of the seat to the vehicle floor. By utilizing the original construction geometry, the correct driving position and compatibility with factory mounting points are maintained.

Specifications and technical data

• SKU: 7118420-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7118420
• Substitutable numbers: 52107118420, 7118420, 52106982918, 6982918, 52107118423 7118423
• Location on the vehicle: Front, Left
• Category: Seats and Sofas

Purpose and function in the vehicle

The seat frame mounted on the front left side is responsible for transferring loads from the seat to the body structure, stabilizing the seat during driving, and maintaining the correct geometry relative to the steering wheel and pedals. In BMW E87, E90, and E91 series vehicles, this is a key load-bearing element to which the rails, adjustment mechanisms, and the upholstered seat body are attached.

This type of frame is used both when replacing a damaged structure due to collision or corrosion, and when swapping seats between vehicles within the same generation. Maintaining the factory mounting layout facilitates installation and allows for the use of existing adjustment mechanisms and seat equipment.

Construction and technical specifications

The seat frame belongs to the Seats and benches category and is a metal skeleton that:

• ensures a rigid connection between the seat and the vehicle floor,
• maintains the correct position of the seat cushion and backrest relative to the body,
• allows for the installation of rails and adjustment mechanisms,
• is adapted for use in the front left zone of the cabin.

The properly designed geometry of the frame allows for maintaining the factory ergonomics of the driver’s position, which translates into driving comfort and predictable vehicle behavior during maneuvers. The stable seat support structure is important for both passive safety and the durability of the entire seat assembly.

Benefits of using an original seat frame

Using a dedicated seat frame for the BMW E87, E90, and E91 series allows you to avoid fitment issues typical of universal solutions or modifications. The most important advantages include:

• Factory mounting points – compatibility with the original floor and body structure facilitates installation and service.
• Consistency with the interior layout – the correct height and angle of the seat relative to the dashboard are maintained.
• Possibility to use existing mechanisms – the frame is adapted to work with factory rails and seat equipment.
• Predictable behavior during operation – the structure is designed for specific BMW models.

A used component of this type is a good solution for repairs of several-year-old and older vehicles, where a reasonable cost is important while maintaining compliance with factory specifications. The original seat frame allows for restoring the correct stiffness and geometry of the seat without the need to interfere with the body structure.

Application in tuning and interior modernization

The front left seat frame can also be used for interior modifications, such as installing seats with a different finish or configuration, provided that structural compatibility is maintained. Replacing the frame itself is often the first step in reconstructing a seat after mechanical damage or when adapting seats from a different trim version within the same BMW generation.

If you are considering a wider cabin modernization, including changing seats or the steering wheel, it is worth checking out tips on choosing used interior components – you will find them in the article Car interior tuning with Global Parts, which discusses the practical aspects of using second-hand seats and steering wheels.

Expanding work on BMW seats

If you are planning a comprehensive repair or modernization of the seating area in your BMW and need other elements from the same group, such as frames, cushions, or backrests, check the available parts in the BMW Seats and benches category.

For older generation vehicles, where the availability of new components is limited, tips on using salvaged parts may also be helpful – this is described in more detail in the article how to deal with repairing older models using salvaged parts, which discusses a practical approach to servicing cars for which components are missing in authorized networks.