Mercedes W639 Side Rail Cover Rear Left N/S Sliding Door Panel Obsidian Black

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W639 Side Rail Cover Rear Left N/S Sliding Door Panel Obsidian Black is an original body component from the Doors and door panels group, designed for the rear left area of the vehicle. It ensures proper coverage of the sliding door rail, stabilizing its operation and protecting the mechanism against contamination. The Obsidian Black Metallic - 197 version allows for visual consistency with the factory body paint.

Specifications and technical data

• SKU: A6396913008-OB
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6396913008
• Substitutable numbers: A6396913008, A 639 691 30 08, KD
• Location on the vehicle: Rear, Left
• Color: Obsidian Black Metallic - 197
• Category: Doors & Door Skins

Purpose and function of the component

The rear left door rail cover in the Mercedes W639 class is responsible for protecting the door track and providing an aesthetic finish to the side of the body. Mounted in the rear section on the driver's side, it works with the guide mechanism, limiting the access of dirt, moisture, and minor mechanical damage to critical sliding points.

Thanks to its precise fit for the specific body generation, the component maintains proper gap geometry, which translates into smooth door closing and a reduction in unwanted vibrations while driving.

Color and visual fit

The cover is finished in Obsidian Black Metallic - 197, which allows for an aesthetic match with the vehicle's factory paint in this color. The metallic black blends well with both dark and lighter body elements, making the part suitable for use both as a replacement part and during local body and paint repairs.

The factory-profiled edges and correct surface structure facilitate installation and any subsequent paint work, should it be necessary to match a different body color.

Installation characteristics

The placement on the vehicle in the rear left part of the body allows for clear identification of the mounting position. The component is designed as a body part from the Doors and door panels group, meaning it works with factory mounting points and the sliding door rail geometry.

When installed correctly, the cover helps maintain stable door operation, limits the ingress of contaminants into the mechanism, and improves the overall rigidity of the side body finish in the rear door area.

Condition and service application

The component comes from disassembly, which in practice means the possibility of an economical vehicle repair while maintaining the manufacturer's original specifications. This type of part is particularly useful for:

• local repairs after collisions in the rear left part of the body,
• replacing a damaged or corroded rail cover,
• restoring the proper operation of sliding doors after bodywork interventions.

Using an original cover allows you to maintain factory fitment and reduces the risk of future door adjustment issues.

Related Mercedes body components

If you are planning a comprehensive repair or upgrade of the door area in your Mercedes and need other elements from the same group, such as skins, reinforcements, or additional panels, check the available parts in the Mercedes Doors and door panels category.

Technical support and knowledge about Mercedes drivetrains

In vehicles equipped with advanced chassis and drivetrain systems, such as Mercedes AWD systems, precise body component fitment is also important for acoustics and driving comfort. If you want to better understand the specifics of the solutions used by the manufacturer and when it is worth choosing used components, take a look at the article xDrive, 4Matic, quattro or 4Motion – a comparison of AWD systems from BMW, Mercedes, Audi and VW.