Mercedes GL X166 Rear Door Seal Gasket Left Right N/O/S A1666970251

Mercedes GL X166 Rear Door Seal Gasket Left Right is a precision component from the Door Upholstery group, designed for installation in the rear part of the vehicle body. It is responsible for the tight closing of the door leaf, noise reduction, and protecting the interior from moisture and contaminants. Thanks to its factory-fit design for the Mercedes GL X166, it ensures stable seating and predictable performance during operation.

Specifications and technical data

• SKU: A1666970251
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1666970251
• Substitutable numbers: A1666970251, A 166 697 02 51
• Location on the vehicle: Rear, Right, Left
• Category: Door Panels

Purpose and vehicle placement

The seal has been designed for installation in the rear part of the vehicle body, on both the left and right sides. This placement allows for maintaining consistent operating characteristics of both rear doors, which is essential for acoustic comfort and proper door closing. The component works in conjunction with the factory door frame structure and the adjacent upholstery, creating a uniform, tight seal.

Technical and functional characteristics

The seal works in direct contact with the door edge and the bodywork, which is why its profile is matched to the geometry of the Mercedes GL X166 body. The properly formed working edge limits the ingress of water, dust, and air gusts into the cabin interior. The appropriate material flexibility promotes even pressure along the entire length, which translates into:

• stable closing of the rear doors on the left and right sides,
• reduction of wind noise at higher speeds,
• protection of door upholstery against moisture,
• maintenance of a consistent fit line between the door and the body.

Thanks to a design consistent with the vehicle's factory specifications, the component does not require body modifications or interference with the door structure – installation takes place in the location provided by the manufacturer.

Benefits of using original door upholstery

Choosing a seal from the Door Upholstery group dedicated to the Mercedes GL X166 allows for maintaining the vehicle's original performance parameters. Proper fitment with the door frame and other trim elements minimizes the risk of looseness, rattles, or leaks. This is particularly important in large SUVs, where the door surface is extensive and the loads acting on the seals are higher than in smaller bodies.

The element from this group is a good choice for:

• replacing a worn or deformed seal,
• post-accident repairs in the rear part of the body,
• eliminating leaks and noises coming from the rear door area.

Condition of the element and practical application

The offered seal belongs to the used parts segment, which allows for economical repair while maintaining original geometry and fit to the body. This solution is particularly beneficial for comprehensive body and paint work, when it is necessary to replace several elements within the rear door area, and the priority is compliance with the vehicle's factory construction. A correctly selected seal helps restore acoustic comfort and cabin tightness after repairs.

Related elements and additional information

If you are planning a comprehensive repair or upgrade of the door zone in your Mercedes and need other elements from the same group, such as door panels, trim panels, or window moldings, check the available parts in the Mercedes Door Upholstery category.

To better take care of the operation and maintenance of the installed components, it is worth checking out practical tips regarding the use of dismantled parts – you will find them in the article How to extend the life of used car parts?, which describes proven methods for protecting body elements and interior equipment.