Volkswagen Passat B7 Rear Double Seat Belt Buckle Centre Left N/S 3AA857739B

Volkswagen Passat B7 Rear Double Seat Belt Buckle Centre Left N/S is an original component from the Seat belts and parts group, designed for the vehicle's rear bench seat. It ensures secure attachment for two rear seat belts, which translates into stable and safe fastening for passengers sitting in the back.

Specifications and technical data

• SKU: 3AA857739B
• Mark: Volkswagen
• Condition: Used
• OEM Part Number: 3AA857739B
• Substitutable numbers: 3AA957739B, 3AA 957 739 B, 3AA857739A, 3AA 957 739 A
• Location on the vehicle: Rear, Left
• Part type: Buckle Tongue
• Category: Seat Belts & Parts

Purpose and function of the buckle

The rear double centre left buckle is responsible for supporting two seat belt fastening points on the rear bench. This component operates in a critical area where significant forces are transferred during braking or collisions, which is why its proper functioning is of key importance for passenger protection.

Its placement in the rear part of the vehicle on the left side allows for correct belt routing and convenient use by people sitting in both the middle and adjacent seats. The buckle design is adapted to the factory mounting system in the Volkswagen, which facilitates installation and ensures proper fitment with the bench seat and belt guides.

Compatibility and fitment for Volkswagen

The buckle has been designed specifically for the Volkswagen Passat B7 model, ensuring full compatibility with the car's factory safety system. This means that it:

• fits the original mounts in the rear bench seat,
• works with standard seat belts,
• maintains the correct belt routing geometry.

Additionally, the part has a dedicated OEM number and interchangeable numbers, which facilitates precise compatibility verification based on catalog numbers and minimizes the risk of selecting the wrong component.

Characteristics of the used component

The offered buckle comes from the secondary market, which allows for an economical replacement of the component while maintaining the original Volkswagen design. A used component is a good solution wherever maintaining the factory vehicle specification at reasonable service costs is a priority.

Before installation, a standard check of the locking mechanism and the cable (if present in the given configuration) is recommended, as well as verifying proper operation through repeated fastening and unfastening of the belt. A properly functioning buckle should provide a distinct click and audible locking of the belt tongue.

Safety, installation, and workshop application

The buckle operates in direct connection with the seat belt system, which is why its replacement is recommended in the event of:

• damage to the locking mechanism,
• problems with unfastening or fastening the buckle,
• visible damage to the housing or mounting.

The component is installed in the rear part of the vehicle on the left side, in accordance with the factory mounting points. For workshops and service centers specializing in the Volkswagen brand, using an original buckle facilitates maintaining the consistency of the safety system and reduces the time required for fitting replacement parts.

Expanding the safety zone in your Volkswagen

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

How to safely buy used seat belt system components

When choosing a used seat belt buckle, it is worth paying attention to the OEM number compatibility, vehicle placement, and the condition of the locking mechanism. Additional tips regarding the verification of secondary market parts, how to check numbers, and minimizing the risk of an incorrect purchase can be found in the Global Parts guide: Safe purchase of used car parts online – a step-by-step guide.