Mercedes W251 Quarter Window Glass Seal Rear Left N/S Gasket A2516702339

The Mercedes W251 Rear Left Body Seal is a precisely profiled body component designed specifically for the rear left window of W251 series models. It ensures a watertight seal between the window and the body, providing protection against water, noise, and air turbulence, as well as stable glazing. Thanks to its construction conforming to original Mercedes factory standards, this seal helps maintain the original body line and proper interior acoustics.

Specifications and technical data

• SKU: A2516702339
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2516702339
• Substitutable numbers: A2516702339, A 251 670 23 39, A2517680124, A 251 768 01 24
• Location on the vehicle: Rear, Left
• Category: Window Seals, Gaskets & Trims

Purpose and Function in the Body

The rear left body seal in the Mercedes W251 operates in a demanding body area where the side and rear sections of the vehicle meet. This component:

• creates a barrier against water, moisture, and dirt entering the interior and the space between the window and the body,
• reduces wind noise and resonances generated at higher speeds,
• supports the correct positioning and stabilization of the window relative to the body frame,
• helps maintain a cohesive appearance of the car's side line, without unsightly gaps.

Due to its specific placement on the vehicle (rear, left side), the seal works with factory mounting points and body geometry, which facilitates installation and minimizes the risk of leaks.

Compatibility and OEM Standard

This seal belongs to the Window Seals and Trim category for Mercedes vehicles. It is a component that meets the standards of factory-fitted parts, which means:

• maintaining the correct profile that matches the window and body frame,
• compliance with factory guide and pressure points,
• the possibility of replacing a worn or leaking seal without requiring body modifications.

This allows for the restoration of original sealing and acoustic comfort parameters upon replacement, without altering the body structure.

Performance Characteristics and Installation

The rear left body seal for the Mercedes W251 has been designed for operation in varying weather conditions and typical body deformations during driving. In practice, this means:

• appropriate flexibility to compensate for body and window movements,
• stable adhesion to contact surfaces after proper installation,
• the possibility of removing and re-installing the window while maintaining correct gap geometry.

The component is intended for installation in a specific location on the vehicle, which simplifies service work – once fitted to the body and window edges, uniform pressure can be achieved around the entire perimeter.

Condition and Benefits of Use

The offered seal is in used condition, allowing for an economical replacement while maintaining compatibility with the original Mercedes construction. In many cases, this is a beneficial solution for post-accident repairs, window replacements, or addressing leaks in older W251 models. Using the original seal geometry helps to:

• reduce the risk of water leaks into the interior and luggage compartment,
• decrease the noise of airflow in the rear cabin,
• maintain the aesthetic appearance of the window edges relative to the body.

Related Body Parts and Further Expansion

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 additional side window seals, window trim strips, or window frame seals, check the available parts in the Mercedes Window Seals and Trim category.

To better plan bodywork and lighting projects, it is worth familiarizing yourself with practical tips on selecting lighting components – the article See More and Better – A Complete Guide to Selecting and Replacing Used LED and Xenon Headlights may be helpful, discussing the approach to original OEM components in the context of safety and installation quality.