Mercedes W177 Double Seat Belt Buckle Clip Rear Middle Right O/S A1778603102

The Mercedes W177 Double Seat Belt Buckle Rear Center is an original part from the seat belts and parts category, designed for the rear seat, right side. This is a precisely engineered double buckle that ensures proper seat belt fastening and a stable connection to the factory mounting points.

Specifications and technical data

• SKU: A1778603102
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1778603102
• Substitutable numbers: A1778603102, A 177 860 31 02
• Location on the vehicle: Rear, Right
• Category: Seat Belts & Parts

Purpose and Function in the Safety System

The double seat belt buckle mounted at the rear right is responsible for the secure fastening of two seat belts in the center of the rear seat. This component is crucial for:

• maintaining the correct belt geometry during driving and braking,
• stable mounting of the belt buckles at the factory anchor points,
• preserving the functionality of the rear seat according to the vehicle manufacturer's specifications.

A properly selected double buckle minimizes the risk of incorrect belt fastening and helps maintain predictable behavior of the safety system in emergency situations.

Construction and Fit for Mercedes W177

The presented double buckle has been designed specifically for the W177 body, which means full compatibility with the rear seat structure and the factory mounting points on the right side. Thanks to this:

• it fits original mountings without the need for modifications,
• it maintains the correct position relative to the seat and backrest,
• it does not interfere with upholstery or plastic elements in the rear interior.

Such a fit is particularly important for safety-related components, where both correct positioning and repeatable operation under all conditions are crucial.

Benefits of Using an Original Double Buckle

Using an original double seat belt buckle in the Mercedes W177 offers a range of practical benefits:

• consistency with the factory safety system – the part comes from the same design line as other belt system components,
• proper cooperation with the retractor and pre-tensioner mechanisms used in the vehicle,
• maintaining user ergonomics – easy access to belt buckles for rear seat passengers,
• aesthetic integration with the interior – the shape and routing of the buckle are adapted to the W177 interior design.

For the user, this means maintaining factory comfort in belt operation and predictable system performance during daily vehicle use.

Item Condition and Service Application

The double seat belt buckle is offered as a used part, which is a sensible service solution for post-accident repairs, replacement of damaged buckles, or completing missing rear seat elements. Choosing a used OEM component allows you to:

• optimize repair costs while maintaining the original construction,
• maintain compliance with factory assembly and operation standards,
• restore full functionality of the rear seating row without altering the body structure.

This is a practical solution for workshops, body and paint shops, and individual users who want to restore the seat belt system's operability in a technically correct manner.

Related Products and Technical Knowledge

If you are looking for other items from the seat belts and parts category dedicated to this brand, check out our offer on Mercedes seat belts and parts, where you will find a wide selection of components for passive safety systems.

When planning vehicle servicing using used parts, it is worth familiarizing yourself with best practices for component selection. See the article on our blog Volkswagen Repair on a Budget? Discover How to Save on Original Car Parts, where we discuss how to consciously use the market for used and aftermarket parts, which can be successfully applied to other brands, including Mercedes.