Mercedes W639 Seat Box Front Left Right N/O/S Seat Mount Base Set A6396601740

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W639 Seat Box Front Left Right N/O/S Seat Mount Base Set is an original seat mounting component designed for installation in the front part of the cabin. This seat base set ensures a stable, rigid, and secure seat mounting, which is crucial for the comfort and ergonomics of both the driver and the passenger. Thanks to its factory-spec geometry and fitment to the interior structure, it maintains the correct seat position relative to the center console and the vehicle floor.

Specifications and technical data

• SKU: A6396601840-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6396601840
• Substitutable numbers: A6396601740, A 639 660 17 40, A6396601840, A 639 660 18 40
• Location on the vehicle: Front, Left, Right
• Category: Centre & Overhead Console Parts

Purpose and vehicle placement

The presented seat base is designed for installation in the front part of the cabin and can be used on both the driver and passenger sides. Its placement at the front of the vehicle allows for precise integration with factory floor mounting points and center console elements, facilitating proper installation routing and maintaining the original interior geometry.

This solution is particularly useful when replacing a damaged base, swapping seats between sides, or during seat layout modifications where maintaining compatibility with the factory mounting system is necessary.

Construction and function in the console system

The seat base belongs to the Console parts group, as it works directly with the center tunnel, covers, and floor trim elements. Its functions include:

• providing a stable mounting point for the seat frame,
• maintaining the correct seat height and angle relative to the console,
• enabling proper operation of seat adjustment mechanisms,
• preserving a consistent visual and functional interior line.

Thanks to its factory design, the base integrates seamlessly with original interior components, reducing the risk of poor fitment, rattles, or looseness in the seat and console area.

Use in service and interior modernization

The used Mercedes seat base is a practical solution for both standard repairs and interior tuning using different seats. It allows you to recreate the factory mounting layout without the need for structural floor modifications, which is essential for safety and compliance with the manufacturer's specifications.

If you are planning to change seats to another model from the same family or want to refresh the cabin while retaining original mounting points, this base provides a solid foundation for further upholstery and mechanical work.

For a broader perspective on cabin personalization possibilities and the use of second-hand components, it is worth reading the article Car interior tuning with Global Parts, which discusses practical aspects of selecting seats and other interior components.

Benefits of choosing an original Mercedes seat base

Choosing an original Mercedes seat base translates into a number of measurable benefits:

• Factory fitment – compatibility with the floor and center console structure, with no need for custom mounts.
• Ergonomic consistency – maintaining the manufacturer-intended seat position relative to the steering wheel, pedals, and console panel.
• Safe integration – enabling proper installation of adjustment mechanisms and seat-related wiring.
• Economical repair – a used component allows for cost reduction while maintaining the original structural specification.

If you are planning a comprehensive repair or modernization of the center interior zone in your Mercedes and need other elements from the same group, such as brackets, frames, or mounts related to the tunnel structure, check out the available parts in the Mercedes console parts category.

Summary

Mercedes W639 Seat Box Front Left Right N/O/S Seat Mount Base Set is a functional structural element that enables proper seat installation in the front part of the cabin and its correct interaction with the center console. This used, original component allows for a technically sound repair or seat layout modification, preserving factory mounting points and the ergonomics intended by the manufacturer.

In the case of older models, where the availability of new components may be limited, it is worth considering the wider use of dismantled parts – you can find more on this topic in the guide how to handle the repair of older models using dismantled parts.