Mercedes X166 Rear Door Seal Gasket Rail Strip Outer Right O/S A1667356800

Mercedes X166 Rear Door Seal Gasket Rail Strip Outer Right O/S is an original body component designed for installation on the rear right side of the vehicle. It ensures a tight fit of the trim strip to the door edge, which limits the ingress of water, dirt, and noise into the cabin. Thanks to its factory-spec fitment, it is a convenient solution for installation and is technically safe for the door structure.

Specifications and technical data

• SKU: A1667356800
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1667356800
• Substitutable numbers: A1667356800, A 166 735 68 00
• Location on the vehicle: Rear, Right
• Category: Window Seals, Gaskets & Trims

Purpose and function of the component

The presented rear right outer door rail seal has been designed specifically for the X166 body type, which guarantees a proper fit to the shape of the door edge. The component operates in the contact zone between the door and the body, stabilizing the trim strip and supporting protection against weather conditions.

Thanks to a properly selected sealing profile, the part helps to reduce:

• the ingress of water and moisture around the door edge,
• the accumulation of debris between the trim strip and the door panel,
• the formation of unwanted noises resulting from loose trim strips.

The placement on the vehicle on the rear right side allows for the precise replacement of only the worn section, without interfering with other body components.

Construction and body fitment

The outer rail seal is a component from the Window seals and trim strips group, which means it has been developed for operation in direct contact with the window and the door panel. The sealing profile is optimized for flexibility and stable retention of the trim strip on the edge, which minimizes the risk of deformation during operation.

The original origin from the Mercedes brand translates into:

• maintaining factory body lines and door edge aesthetics,
• proper fitment with the window and door frame,
• compatibility with factory trim strip mounting points.

Such fitment facilitates installation and reduces the need for additional modifications or adjustments of the component on the vehicle.

Component condition and service application

The offered seal comes from dismantling, which makes it a cost-effective solution while maintaining the manufacturer's original specifications. This type of part is suitable for both post-accident repairs and for replacing worn or leaking components in a daily-driven vehicle.

Choosing a used, original component allows for:

• maintaining material consistency with other body components,
• reducing costs compared to new replacements,
• preserving the factory operating characteristics of the door and trim strip.

Benefits of using the original rail seal

Using the original rear right outer door seal in a Mercedes X166 translates into stable trim strip operation and improved vehicle comfort. A correctly selected component helps reduce wind noise around the door area and also decreases the risk of corrosion in the panel edge area.

The main advantages include:

• Factory fitment for the specific body model,
• consistency with other seals and trim strips in the vehicle,
• the ability to replace only the damaged section without interfering with other door zones.

If you are planning a comprehensive repair or modernization of the door and window sealing zone in your Mercedes and need other components from the same group, such as additional edge seals, guide rails, or sealing profiles, check the available parts in the Mercedes window seals and trim strips category.

Additional technical support

When working on the body and components adjacent to the suspension, it is worth paying attention to the general condition of the sub-assemblies responsible for driving comfort. If you notice disturbing noises while driving over bumps and want to better plan the scope of repairs, a service guide may be helpful. You can find more practical tips in the article Knocking in the suspension? Discover a clever way to restore factory handling precision without spending a fortune at the service center, which will help you assess how to combine the replacement of body components with the optimization of suspension performance.