Mercedes X166 Window Quarter Rubber Rear Right O/S A1666809000

Mercedes X166 Window Quarter Rubber Rear Right O/S is an original body component designed for precise sealing of the rear right section of the vehicle. Thanks to its factory-fit design, it ensures stable window guidance, reduces wind noise, and helps maintain proper interior sealing. This is a practical solution for users who want to restore proper window operation and maintain a consistent look for the side bodywork.

Specifications and technical data

• SKU: A1666809000
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1666809000
• Substitutable numbers: A1666809000, A 166 680 90 00
• Location on the vehicle: Rear, Right
• Category: Window Seals, Gaskets & Trims

Purpose and fitment

The presented seal is an item from the Window seals and trims category, specifically designed for installation in the rear right part of the body. The design, matched to the X166 series body lines, allows for proper adhesion to the glass and window frame, which translates into stable window movement during opening and closing.

The placement on the vehicle on the rear right side makes it easy to identify the correct mounting point and minimizes the risk of error when selecting the part. The appropriate profiling of the seal edge supports proper water drainage and limits the ingress of contaminants into the door interior.

Technical function and benefits of installation

The Mercedes X166 Window Quarter Rubber Rear Right O/S serves several important operational functions:

• ensures a tight connection between the glass and the body frame, reducing air drafts,
• helps reduce external noise in the cabin at higher speeds,
• supports the protection of the door interior against moisture and fine debris,
• stabilizes the position of the glass in the guides, which promotes smooth operation of the lifting mechanism.

By using an original component, dimensional and material consistency with other body parts is maintained, which facilitates installation and reduces the need for additional adjustments. This is particularly important for vehicles where maintaining the factory finish standard is a priority.

Product characteristics and condition

The seal comes from the Mercedes manufacturer's range, which means compliance with the factory design specifications for the given model. The item is marked as used, making it a reasonable choice for users looking for a solution that allows for restoring proper window sealing at controlled repair costs.

Its original origin helps maintain the correct profile geometry, which is important for both sealing and the aesthetics of the side bodywork. In practice, this translates into easier installation and better fitment to existing mounts and window guides.

Installation tips and service application

When replacing the Mercedes X166 Window Quarter Rubber Rear Right O/S, it is recommended to thoroughly clean the contact surface on the body frame and check the condition of the guides and the window lifting mechanism. A properly seated seal should adhere evenly along its entire length, without twists or tension, which helps avoid subsequent leaks and improper window operation.

This type of component is often replaced during:

• repairs after collisions in the rear right part of the body,
• eliminating leaks and noise in the area of the rear right window,
• comprehensive renovation of the side body zone in X166 models.

Complementary Mercedes Window seals and trims

If you are planning a comprehensive repair or upgrade of the side body zone in your Mercedes and need other elements from the same group, such as additional window seals, trim strips, or contact elements, check the available parts in the Mercedes Window seals and trims category.

More about the cost-effectiveness of used components

When selecting used body and equipment components, it is worth knowing the basic principles of assessing technical condition and repair cost-effectiveness. Practical information on how to approach the purchase of used components can be found in the guide Why it is worth buying used gearboxes and engines – facts instead of myths, which also covers issues of selecting parts by OEM numbers and service cost analysis.