BMW 3 Series E91 E91N Left roof railing bar exterior trim N/S 7118503

BMW 3 Series E91 E91N Left roof railing bar exterior trim is an original body component designed for installation on the left side of the roof in 3 Series Touring models. This used roof railing bar allows for maintaining a consistent styling line while ensuring stable mounting for roof accessories. It is a practical solution for users who want to restore full functionality of the roof rails following damage or wear of the factory component.

Specifications and technical data

• SKU: 7118503
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 51137118503
• Substitutable numbers: 51137118503, 7118503
• Weight: 150
• Location on the vehicle: Left
• Category: Other Exterior Parts & Accessories

Purpose and function of the roof railing bar

The left roof railing bar on the BMW E91/E91N estate body is responsible for stable guidance of crossbars and other load-bearing systems mounted on the roof. A properly selected roof railing bar ensures:

• secure mounting of roof racks and cargo boxes,
• consistent roof line guidance on the driver's side,
• proper distribution of loads transferred to the body structure.

Thanks to maintaining the factory geometry of the railing, the installation of roof accessories is performed in a predictable manner, which is essential for both safety and comfort of use.

Construction and fitment for BMW E91/E91N

The roof railing bar has been designed specifically for the 3 Series Touring body, taking into account the characteristic roof profile and mounting points. Placement on the left side of the vehicle guarantees compatibility with the factory layout of mounting holes and seals. The component is prepared for use with original mounts, which facilitates:

• precise fitment with the roof line,
• maintaining tightness in the mounting area,
• limiting stress within the roof paneling.

The appropriately selected weight of the component promotes the maintenance of proper weight distribution on the body, which is significant when operating with an additional load on the roof.

Benefits of using an original roof railing bar

Choosing a used roof railing bar dedicated to BMW allows for maintaining the factory installation standard without the need for modifications. Key advantages include:

• compatibility with original BMW roof accessories,
• preservation of the original appearance of the side body line,
• possibility of economical repair after mechanical damage or corrosion of the previous component.

A used body component is a sensible choice for maintenance repairs, especially when you want to match the specific E91/E91N generation without compromises in terms of geometry and mounting method.

Practical application and installation

The roof railing bar on the left side is essential wherever the vehicle regularly works with a roof rack, bicycle carriers, or a cargo box. A properly selected bar minimizes the risk of play and unwanted vibrations while driving with a load. During installation, it is worth paying attention to:

• the condition of the mounting points in the roof,
• correct positioning of seals and covers,
• even tightening of the mounting elements in accordance with the vehicle manufacturer's recommendations.

Such an approach allows for maintaining the tightness and durability of the connection, which is important especially during intensive vehicle use in changing weather conditions.

Expanding body configuration and additional materials

If you are planning a comprehensive repair or upgrade of the roof area in your BMW and need other components from the same group, such as additional trims, covers, or railing mounts, check the available parts in the Other BMW category.

For drivers interested in comparing the character of sports versions with classic variants of premium models, an article discussing the differences in engine, brake, and chassis construction in RS sports variants versus standard versions may be useful – you can find it here: Audi RS vs other models – what is hidden under the hood and chassis?.