Mercedes W251 Quarter Window Sealing Rear Left N/S Gasket Seal A2517680124

Mercedes W251 Rear Left Side Window Seal is an original body part designed for the rear left side window in R-Class models. Its precisely shaped profile ensures a tight fit to the body, reducing noise, vibrations, and water ingress into the vehicle's interior. Thanks to its factory fit, the seal restores proper window operation and cabin acoustic comfort.

Specifications and technical data

• SKU: A2517680124
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2517680124
• Substitutable numbers: A2517680124, A 251 768 01 24
• Location on the vehicle: Rear, Left
• Category: Window Seals, Gaskets & Trims

Purpose and Function in the Body

The seal is specifically designed for installation in the rear left section of the body, in the side window area. It is responsible for:

• maintaining the stable position of the window relative to the door frame or body,
• limiting the ingress of water, dust, and air into the interior,
• reducing wind noise at higher speeds,
• protecting the glass edges from mechanical damage.

Thanks to its construction in line with factory standards for Window Seals and Trim for this model, installation requires no modifications or forceful adjustments.

Construction and Fit for Mercedes W251

The seal's profile is shaped to match the W251 body geometry, ensuring proper adhesion along its entire contact length with the window and body. The appropriately selected material stiffness allows for:

• secure seating in the mounting groove,
• maintaining its shape over a longer period of use,
• proper cooperation with the window lifting mechanism (if present in the specific variant).

This precise fit translates to stable side window operation and reduced risk of creaks and squeaks when driving over uneven surfaces.

Item Condition and Service Application

The offered seal is a second-hand part, allowing for an economical repair of the side body area while maintaining the original part's geometry. It is particularly useful in situations where:

• the existing seal is perished or cracked,
• there are water leaks around the rear left window,
• the vehicle has undergone bodywork and paint repairs, and sealing needs to be restored.

Using an original seal instead of universal aftermarket alternatives simplifies installation and reduces the risk of poor fitment with the body.

Benefits of Installing an Original Seal

Replacing a worn-out seal with a dedicated part for the rear left window on the Mercedes W251 brings tangible operational benefits:

• improved acoustic comfort inside the vehicle,
• increased protection of upholstery and electrical systems from moisture,
• reduced window fogging in the rear cabin area,
• more stable window operation in its guides.

For owners who care about maintaining the car's factory character, this solution helps preserve the body's technical and visual consistency.

If you are planning a comprehensive repair or upgrade of the side glazing area in your Mercedes and need other parts from the same group, such as window frame seals, trim strips, or additional sealing profiles, check the available parts in the Mercedes Window Seals and Trim category.

To better plan service work on your car and understand the relationships between body components and the drivetrain, it is worth consulting the guide Clutch and Dual-Mass Flywheel – Diagnostics and Part Selection for the Drivetrain, which helps to take a holistic approach to vehicle maintenance.