Mercedes Vito W639 Front Seat Rail Floor Mounting Holder Bracket A6399500374

Description

Mercedes Vito W639 Front Seat Rail Floor Mounting Holder Bracket is a precision seat mounting component for the front area, designed specifically for the seat structure of this model. It is responsible for the stable guidance of the seat along the rails, ensuring repeatable positioning for the driver or passenger and proper operation of the adjustment mechanisms. By maintaining the original geometry, the rail supports secure seat anchoring to the body and maintains the proper rigidity of the connection.

Specifications and technical data

• SKU: A6399501800
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6399501800
• Substitutable numbers: A6399501800, A 639 950 18 00, A6399500374, A 639 950 03 74, KD
• Location on the vehicle: Front
• Category: Seats and Sofas

Purpose and function in the vehicle

The front seat rail in the Mercedes Vito W639 operates in a critical area of the cabin, connecting the seat structure to the vehicle floor. It is responsible for:

• guiding the seat along the vehicle’s longitudinal axis,
• transferring loads from the seat to the body structure,
• maintaining a stable seat position during braking and acceleration,
• working with the mechanisms for adjusting the seat’s distance from the pedals and steering wheel.

Thanks to the preservation of the factory profile and mounting points, the rail allows for proper seat installation without interfering with the floor structure or requiring additional modifications.

Compatibility and seat fitment

The component has been developed for the factory seats used in the Mercedes Vito W639, which translates into proper fitment with the seat frame and vehicle mounting points. The rail is intended for installation in the front area, ensuring compatibility with:

• original mounting hole spacing,
• factory seat height,
• guide rail geometry and longitudinal adjustment range.

Such fitment reduces the risk of play, unwanted noises, and uneven wear of the adjustment mechanisms.

Benefits of using the original rail

Using the front seat rail dedicated to the Vito W639 allows for maintaining the structural integrity of the entire seating system. In practice, this means:

• stable seat mounting even during intensive use of a commercial or passenger vehicle,
• maintaining the driver’s position as intended by the manufacturer,
• proper interaction with seat belts and other seating area components,
• easier diagnostics and service in the future due to the preservation of the original design solution.

This is particularly important in commercial vehicles, where seats are frequently adjusted and subjected to significant operational loads.

Application in interior restoration and modernization

The front seat rail is suitable both for standard replacement of a damaged component and for broader cabin refurbishment work. It can be used for:

• repairing the seat mounting system after a collision or mechanical damage,
• replacing worn-out guides in a heavily used vehicle,
• modernizing the seating area using branded seats from dismantling.

If you are considering broader comfort improvements in your car and want to better plan your seat work, it is worth checking out the practical tips in the article Interior metamorphosis: How branded seats from dismantling will drastically improve comfort and increase the value of your car.

Expanding the seating area in your Mercedes

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