Mercedes W176 C117 Rear Left N/S Seat Belt Buckle Tensioner A1768600369

Mercedes W176 C117 Rear Left N/S Seat Belt Buckle Tensioner is an original safety system component designed for installation on the rear left side of Mercedes vehicles. The precise construction of the buckle ensures proper seat belt fastening, stable mounting, and compatibility with the factory seat geometry, which translates into safe and comfortable use.

Specifications and technical data

• SKU: A1768600369
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1768600369
• Substitutable numbers: A1768600369, A 176 860 03 69, BG
• Location on the vehicle: Rear, Left
• Category: Seat Belts & Parts

Purpose and function in the vehicle

The rear left seat belt buckle is responsible for mechanically securing the seat belt in the rear seat area. This component works with the factory seat belt, allowing for its proper insertion, tension control, and quick release when needed. The vehicle placement in the rear – left side area allows for maintaining full functionality of the rear seat according to the manufacturer's specifications.

Thanks to its dedicated fit to the body and seat structure, the buckle does not require any modifications, and its geometry is consistent with factory mounting points. This is particularly important in the context of passive safety systems, which assume specific positioning of seat belt anchor points relative to the passenger's silhouette.

Construction and fitment for Mercedes W176 / C117

Mercedes W176 C117 Rear Left N/S Seat Belt Buckle Tensioner has been designed as part of the Seat belts and parts system, which means full integration with the factory solutions used in these models. The buckle construction is optimized for:

• correct guidance of the seat belt tongue,
• stable mounting in the seat structure or floor,
• ergonomic access for the passenger sitting in the rear left seat.

The original Mercedes origin helps maintain visual consistency of the interior and compatibility with existing upholstery elements and covers. As a result, there are no unwanted play, squeaks, or issues with accessing the release button after installation.

Performance characteristics and installation benefits

The rear left seat belt buckle has been constructed for long-term operation in demanding daily driving conditions. The applied mechanical solutions ensure:

• secure latching of the belt tongue and a clear fastening signal,
• adequate resistance to loads acting during sudden braking,
• easy belt release using a button with a tactile feel.

Choosing an original buckle from dismantling allows you to maintain the factory operating parameters of the safety system while reducing costs compared to new parts from an authorized service center. This is a practical solution for both individual users and workshops specializing in servicing Mercedes vehicles.

Condition, verification, and service application

The item is offered as a used part, which in practice means it comes from an operated vehicle but has been verified for suitability for further installation. This type of component is particularly useful for:

• post-accident repairs in the rear cabin area,
• fixing malfunctions of the belt fastening mechanism after years of use,
• restoring full functionality of the rear seat.

Thanks to the preservation of the factory design and fitment to the specific location on the vehicle, the installation proceeds in a predictable manner for an experienced mechanic, without the need for adaptation or modification of the installation.

Technical support and additional information

When selecting safety system components, it is worth using original parts from dismantling, which allows you to maintain the level of comfort and reliability characteristic of the Mercedes brand. You can find more about the benefits of using original used components in vehicles of this brand in the article: Used parts for Mercedes – original components from dismantling.

If you are planning a comprehensive repair or upgrade of the rear seat passenger safety zone in your Mercedes and need other elements from the same group, such as tensioners, complete seat belts, or additional mounts, check the available parts in the category Mercedes seat belts and parts.

For users who want to consciously and safely buy used components online, a practical guide describing the stages of verification and selection of parts may be helpful: Safe purchase of used car parts online – a step-by-step guide.