Mercedes W166 Sealing Rail Outer Door Rear Left N/S Moulding Strip A1667356900

Mercedes W166 Sealing Rail Outer Door Rear Left N/S Moulding Strip is an original body component from the Protective and decorative strips group, designed for installation on the rear left side of the vehicle. It ensures tight window guidance and an aesthetic finish to the door edge, which translates into the acoustic and visual comfort of the car.

Specifications and technical data

• SKU: A1667356900
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1667356900
• Substitutable numbers: A1667356900, A 166 735 69 00
• Location on the vehicle: Rear, Right
• Category: Body Mouldings & Trims

Purpose and function of the component

The presented sealing rail is designed specifically for the Mercedes W166 body and operates in the rear left area of the vehicle. It is responsible for guiding and sealing the door window, limiting the ingress of water, dirt, and noise into the cabin. At the same time, it serves a decorative function, streamlining the side line of the body and maintaining a consistent look of the factory finish.

Construction and body fitment

As an original Mercedes component, the rail is precisely matched to the geometry of the rear doors in W166 models. The profile shape and mounting points are consistent with factory specifications, which facilitates installation and allows for proper window operation and sealing at the contact point with the bodywork.

This solution minimizes the risk of leaks and improper fitment, which often occur with universal aftermarket replacements. As a result, after replacement, you can maintain stable window guidance and even pressure along the entire length of the door edge.

Condition, application, and benefits of replacement

The component comes from a used vehicle, making it an attractive cost-effective alternative to new parts while maintaining the original manufacturer's specifications. This type of rail is particularly useful in situations where:

• leaks or wind noise appear at the door edge at higher speeds,
• the existing rail is mechanically damaged, deformed, or loose,
• it is necessary to restore the factory look of the side body line after body and paint repairs.

Replacing it with an original sealing rail allows for improved acoustic comfort, reduced water ingress into the door interior, and a consistent, orderly appearance of the side of the body.

Why choose an original Mercedes rail

The original rear door sealing rail for the Mercedes W166 provides:

• factory fitment to the shape of the door and window,
• compatibility with original mounting points on the body,
• maintenance of proper window lifting mechanism operation,
• visual consistency with other side trim elements.

Thanks to this, it is a technically safe solution that is predictable during installation and allows for maintaining the finish standard characteristic of this brand.

Expanding upgrades within body trim

If you are planning a comprehensive repair or upgrade of the side door area in your Mercedes and need other components from the same group, such as covers, overlays, or additional strips, check out the available parts in the Mercedes protective and decorative strips category.

Technical support and part selection

Selecting the correct sealing rail for a specific body version and installation side is crucial for sealing and proper window operation. It is worth paying attention to the compatibility of the placement on the vehicle and ensuring that components from the same model family are used. In case of doubts regarding fitment, it is helpful to compare the shape and mounting method with the rail currently installed in the vehicle.