Mercedes W177 Window Sealing Rear Left Door N/S Frame Gasket Seal A1777351300

Mercedes W177 Window Sealing Rear Left Door N/S Frame Gasket Seal is an original component from the Window seals and trims group, designed for installation in the rear left door of Mercedes vehicles. It ensures a tight window guide, reduces wind noise, and helps maintain proper interior insulation against water and contaminants.

Specifications and technical data

• SKU: A1777351300
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1777351300
• Substitutable numbers: A1777351300, A 177 735 13 00, BG
• Location on the vehicle: Rear, Left
• Category: Door Panels

Purpose and function of the seal

The presented seal is tailored to the rear zone, on the left side, allowing for precise fitment with the door frame and window in the Mercedes W177 body. It is responsible for stable window guidance in the channel, vibration reduction, and limiting air drafts when driving at higher speeds.

Thanks to a design consistent with factory manufacturer standards, the component works seamlessly with the window lifting mechanism and door trim, without causing stress or unnatural deformations.

Benefits of using an original seal

• Improved acoustic insulation – reduction of cabin noise originating from the rear window area.
• Protection against moisture – limiting the risk of water ingress into the door interior and cabin.
• Stable window guidance – smoother operation of the lifting and lowering mechanism.
• Consistency with the factory body line – maintaining the original fitment of door components.

Using a dedicated seal in the rear left part of the body helps maintain vehicle comfort and reduces the risk of accelerated corrosion within the door area.

Installation characteristics

The seal is prepared for installation in the factory location, maintaining the original routing along the window perimeter and door frame. A correctly installed component ensures even pressure against the glass and door sheet metal, which translates into stable operation of the entire system.

Placement on the vehicle: rear – left side allows for clear identification of the mounting position and avoids errors when selecting parts. Replacing the seal is recommended in case of visible cracks, deformations, leaks, or increased noise in the rear window area.

Condition and origin

The component comes from a Mercedes vehicle and is classified as used, which means it may show signs of wear typical for this group of parts, while maintaining the functionality required for further use. For many users, this is a reasonable compromise between cost and maintaining the original manufacturer's specification.

Choosing an original seal from the secondary market allows you to maintain technical consistency with other body components, without the need to use replacements with uncertain fitment.

Expanding the sealing zone in the Mercedes W177

If you are planning a comprehensive repair or upgrade of the door glazing zone in your Mercedes and need other elements from the same group, such as additional perimeter seals, window trims, or guide profiles, check the available parts in the Mercedes Window seals and trims category.

If you want to better understand the advantages of choosing secondary market components and the principles of their proper selection based on manufacturer markings, the Global Parts guide may be helpful: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?, which discusses a practical approach to selecting used components in modern vehicles.