Mercedes GL X166 Rear Door Window Glass Quarter Side AS3 Right O/S A1667301055

Mercedes GL X166 Rear Door Window Glass Quarter Side AS3 Right O/S is an original body component designed for installation in the rear passenger side area. As a component from the Car windows group, it ensures proper interior illumination, structural body stability, and compliance with the factory styling line of the GL X166 model.

Specifications and technical data

• SKU: A1667301055
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1667301055
• Substitutable numbers: A1667301055, A 166 730 10 55
• Location on the vehicle: Rear, Right
• Category: Car Glass

Purpose and fitment

The offered rear right side window has been designed specifically for the Mercedes GL X166 generation body, taking into account factory curves, bending radii, and window opening dimensions. As a result, proper adhesion to the seals is maintained after installation, and the vehicle's side line remains consistent with the manufacturer's original design.

Placement in the rear, right side of the vehicle zone allows for precise identification of the part when selecting components for a specific body version. This is particularly important for post-accident repairs, where accurate restoration of the body's geometry and side stiffness is essential.

Technical characteristics of the glass

As a glass marked with the AS3 class, this element belongs to the group of windows with an increased level of tinting, which helps to reduce interior heating and improves passenger comfort in the rear part of the cabin. The tempering technology used ensures a controlled breakage pattern in the event of damage, which increases vehicle user safety.

The original glass construction is optimized for compatibility with factory seals, moldings, and mounting elements of the Mercedes GL X166 body. Thanks to this, the installation process is predictable, and the risk of leaks, rattles, or vibrations is reduced.

Benefits of using an original used window

Choosing an original Mercedes car window from the secondary market is a solution that allows you to maintain factory-quality fitment while optimizing repair costs. The part comes from dismantling, which means it has already been verified for compatibility with the given body type.

Key advantages of this solution include:

• preservation of the original geometry and side structural stiffness,
• visual consistency with other windows in the vehicle,
• no need for adaptation of mounts or seals,
• more predictable material behavior during operation compared to replacements of unknown origin.

For premium car users, maintaining an appropriate level of acoustic insulation is also important – using a window that complies with factory specifications helps reduce wind noise and vibrations transmitted to the interior.

Installation zone and service recommendations

The element is intended for installation in the rear part of the body on the right side, so during replacement, it is worth paying attention to the condition of adjacent seals, decorative moldings, and guides. Proper preparation of the mounting surface and the use of appropriate sealing materials allow for maintaining the tightness and durability of the connection.

Due to the nature of side window operation, it is recommended that the installation be performed by a workshop experienced in handling Mercedes GL X166 bodies. Proper alignment of the glass relative to the frame and adjacent elements minimizes the risk of stresses that could lead to cracks or leaks in the future.

Repair expansion and knowledge about used parts

If you are planning a comprehensive repair or upgrade of the side glazing area in your Mercedes and need other elements from the same group, such as door windows, quarter glasses, or additional glass panels, check the available parts in the Mercedes car windows category.

When selecting components from the secondary market for premium cars, it is worth knowing current trends and best practices. You can find more about the cost-effectiveness of using used original parts in high-end vehicles in the article: Crisis in the new parts market? Why used originals for premium cars (BMW, Mercedes, Porsche) are the hottest trend in 2026.