BMW Z4 E89 Roadster Folding Hard Top Roof Frame Left N/S Arm Hinge Lock

BMW Z4 E89 Roadster Folding Hard Top Roof Frame Left N/S Arm Hinge Lock is an original roof mechanism component, designed for precise operation within the folding roof system. This used component in black allows for restoring the proper operation of the left roof arm without the need for an expensive replacement of the entire mechanism. It is a solution for users who expect factory fitment and a proven design in their BMW Z4 E89 Roadster.

Specifications and technical data

• SKU: 7245945
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7245945
• Substitutable numbers: 54347245945, 7245945, 54377188243, 7188243
• Location on the vehicle: Left
• Color: Black
• Category: Other Exterior Parts & Accessories

Purpose and function of the component

The presented left folding roof arm with hinge and lock is responsible for stable guidance and secure locking of the roof structure on the driver's side. The component works with other parts of the system, ensuring:

• correct folding and unfolding of the roof along the left side of the body,
• controlled positioning of the roof panel relative to the bodywork,
• mechanical securing of the roof in the closed position.

By maintaining the original geometry and mounting points, the arm allows for the preservation of the factory roof kinematics, which is important for both sealing and user comfort.

Construction, placement, and color

The component is intended for installation on the left side of the vehicle, in the folding roof mechanism area. The arm construction, integrated with the hinge and lock, allows for load-bearing during roof movement and locking, minimizing stress at critical points of the body.

The black color of the component facilitates aesthetic integration with other structural and upholstery elements in the luggage compartment and guide rail area, which is especially important in vehicles with exposed parts of the roof mechanism.

Benefits of using an original roof arm

Using an original folding roof arm in a BMW Z4 E89 Roadster brings a number of practical benefits:

• Factory fitment – original mounting points and mechanism operating geometry preserved.
• Consistency with other roof elements – compatibility with existing guides, actuators, and locks.
• Reduced repair costs – possibility of replacing a single arm instead of the entire roof module.
• Stable mechanism operation – correct guidance and locking of the roof on the left side, which affects comfort and safety of use.

The used component allows for an economical repair while maintaining a design consistent with the manufacturer's solutions, which is particularly important in the case of precise moving systems such as a folding roof.

Condition, verification, and fitment

The part comes from dismantling and is intended for reinstallation in a vehicle where it is necessary to restore the efficiency of the roof mechanism on the left side. Before purchasing, it is worth verifying compatibility with your BMW Z4 E89 Roadster, especially regarding the body version and roof mechanism configuration.

Additionally, thanks to the presence of the OEM part number and interchangeable numbers in the technical specification, it is possible to precisely match the component to the specific vehicle configuration, which minimizes the risk of installation incompatibility.

Repair expansion and additional materials

If you are planning a comprehensive repair or upgrade of the folding roof area in your BMW and need other elements from the same group, such as additional arms, hinges, or mechanical locks, check the available parts in the Other BMW category.

When working on body and chassis systems, including moving mechanisms, it is also worth expanding your knowledge about the structural differences between standard and sports versions – the material describing the characteristics of more powerful models, available in the article Audi RS vs other models – what is hidden under the hood and chassis?, which discusses, among other things, the impact of changes in suspension and brakes on vehicle operation, may be helpful.