Waist Rail BMW E88 Interior Door Side Trim Lateral Panel Rear Right O/S 9128774

Visual condition of the part 

The product shows signs of use visible in the photos. 

Waist Rail BMW E88 Interior Door Side Trim Lateral Panel Rear Right is an original body component from the Window seals and trims group, designed for the rear right section of the roof in the BMW 1 Series E88 convertible. It provides an aesthetic finish to the roof edge and a stable cover for a critical area of the bodywork, ensuring a clean appearance and the proper operation of adjacent components.

Specifications and technical data

• SKU: 9128774-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9128774
• Substitutable numbers: 9128774, 51439128774
• Location on the vehicle: Rear, Right
• Category: Window Seals, Gaskets & Trims

Purpose and function of the component

The described trim acts as a cover and end cap in the rear right section of the roof, in an area critical for guiding the roof lining edges and seals. Thanks to its precise profile matched to the BMW E88 body:

• it organizes the roof line in the rear zone of the vehicle,
• it masks mounting points and structural edges,
• it supports the correct positioning of adjacent seals and trims,
• it reduces the risk of debris entering structural gaps.

Construction and fitment for BMW E88

The trim has been designed specifically for the BMW 1 Series E88 convertible body, taking into account the characteristic geometry of the rear roof section. The appropriate profiling and factory mounting points allow for:

• stable seating in the rear right roof zone,
• a seamless transition of the body line between the roof and the rear part of the chassis,
• preservation of factory gaps and contours, without the need for modifications.

As a result, the component integrates well with other trims and seals, maintaining a consistent, factory-finish character.

Performance characteristics and installation

As an element from the Window seals and trims group, the roof trim operates in the immediate vicinity of seals and moving roof cover parts. Proper fitment of this component is important for:

• maintaining uniform gaps between the roof and the body,
• reducing stress on adjacent seals,
• ensuring the correct operation of the roof folding mechanism (no collision with the trim),
• an aesthetic closure of the vehicle's side line.

Installation is carried out using the factory mounting points provided for this model, which facilitates service and replacement in workshop conditions or at a specialized body and paint shop.

Benefits of using an original roof trim

Using the correct trim in the rear right section of the roof in a BMW E88 allows for restoring the consistent appearance of the bodywork after body repairs, seal replacements, or roof component maintenance. Key advantages include:

• preservation of the factory geometry and side line of the vehicle,
• better integration with existing seals and adjacent trims,
• an organized, aesthetic appearance of the rear roof section,
• the ability to restore the original condition after a collision or roof disassembly.

This solution is particularly important for precise body repairs, where compliance with factory specifications and assembly repeatability are essential.

Component condition and practical application

The offered trim is a used part, which in practice means the possibility of an economical repair of the rear right roof section while maintaining the original construction. This type of component is suitable for both post-accident repairs and for replacing missing parts after previous disassemblies or body modifications.

In the case of bodywork and renovation tasks within the convertible roof area, using the correct cover and end cap helps avoid makeshift solutions that could disrupt the body line or hinder subsequent adjustment of the roof mechanism.

If you are planning a comprehensive repair or upgrade of the window and roof zone in your BMW and need other elements from the same group, such as covers, overlays, or additional trims, check the available parts in the BMW Window seals and trims category.

If you want to better understand the specifics of aftermarket components and make informed choices when selecting used body parts, it is worth reading the article Used car parts: Myths and facts you need to know, which organizes the most important information regarding their practical application.