Mercedes W251 Rear Door Sealing Rail Innerbelt Window Right O/S A2517351865

Mercedes W251 Rear Door Sealing Rail Innerbelt Window Right O/S is a precisely fitted body component responsible for the seal and stable guidance of the window in the rear right door. As part of the Window seals and rails group, it provides proper protection against water, dust, and noise, improving the acoustic comfort and usability of the cabin. Using an original pre-owned part is a sensible choice for door maintenance when you prioritize factory fitment and controlled repair costs.

Specifications and technical data

• SKU: A2517351865
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2517351865
• Substitutable numbers: A2517351865, A 251 735 18 65
• Location on the vehicle: Rear, Right
• Category: Window Seals, Gaskets & Trims

Purpose and function of the component

The described inner window rail is designed for installation in the rear right door of the Mercedes W251 class vehicle. Its function is to:

• seal the lower edge of the window from the inside of the door,
• limit the ingress of moisture and contaminants into the door panel interior,
• provide stable guidance for the window during raising and lowering,
• reduce vibrations and unwanted noises from the window regulator mechanism.

Thanks to its proper profile and fitment to the door structure, the rail helps maintain the correct geometry of the window operation and supports the long-term efficiency of the window regulator mechanism.

Benefits of using an original sealing rail

Using an original sealing rail in a Mercedes W251 translates into a number of practical operational benefits:

• Factory fitment to the door shape – no modifications required, proper adhesion to the glass and door panel.
• Stable window operation – reduction of lateral play, lower risk of jamming and uneven movement.
• Better protection of the door interior – reduced exposure of the window regulator mechanism and electrical wiring to water and dirt.
• Improvement of acoustic comfort – reduction of wind noise and rattling coming from the window area.

By choosing a used, original rail from this group, you gain a component with parameters consistent with factory specifications, which is particularly important for precision body components.

Installation characteristics and application

The rail has been designed specifically for the rear right body zone, which facilitates the identification of the correct installation location and reduces the risk of errors when selecting parts. In practice, this means:

• clearly defined placement on the vehicle – rear, right side,
• compatibility with the door structure characteristic of the W251,
• suitability for use in post-collision repairs, window replacement, or window regulator mechanism regeneration.

With proper installation, the rail works in conjunction with other door elements, such as external seals, guides, or trim, creating a coherent system for protecting and guiding the window.

Why choose a used original component

The used Mercedes W251 Rear Door Sealing Rail Innerbelt Window Right O/S is a solution that allows you to combine cost control with the preservation of proper technical parameters. You receive a component originating from the same production line as the factory-installed part, which helps maintain the structural integrity of the body. If you want to learn more about the specifics of purchasing second-hand parts and making informed choices for your car, the article Used parts – Your guide to the best offers in the automotive store will be helpful, where you will find practical tips regarding the operation and selection of such components.

Expanding the service of the window and seal zone in Mercedes

If you are planning a comprehensive repair or upgrade of the window and seal zone in your Mercedes and need other elements from the same group, such as additional rails, inner seals, or window guides, check the available parts in the Mercedes Window seals and rails category.