Audi A4 B9 A4 S4 8W Exterior C Pillar Trim Rear Right O/S Gloss Black 8W9839904A

Audi A4 B9 A4 S4 8W Exterior C Pillar Trim Rear Right O/S Gloss Black is an original body component from the Protective and decorative trims group, designed for installation on the rear right side of the C-pillar. The glossy black finish helps restore the consistent look of the side body line while maintaining the factory character of the Audi A4 and S4 B9 generation models.

Specifications and technical data

• SKU: 8W9839904A
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W9839904A
• Substitutable numbers: 8W9839904A, 8W9 839 904 A
• Location on the vehicle: Rear, Right
• Part type: Pillar
• Category: Body Mouldings & Trims

Purpose and function of the C-pillar trim

The described trim is dedicated to installation on the rear right side of the vehicle body, in the C-pillar area. It is responsible for the aesthetic finish of the side window and door zone, as well as for protecting the body edge against minor mechanical damage, scratches, or dirt.

Thanks to its precise fit for the specific Audi A4 / S4 B9 generation, the element maintains the correct geometry, which facilitates installation and allows for an even line of contact with the body. The gloss black finish emphasizes the modern character of the car and blends well with both light and dark paint colors.

Benefits of using an original protective trim

Using a factory C-pillar trim on the rear right side of the body allows you to:

• restore the consistent look of the side window line after damage or wear of the previous element,
• maintain visual consistency with other trim elements on the body,
• preserve proper fitment with the window, seals, and adjacent body panels,
• reduce the risk of corrosion and sheet metal edge damage thanks to additional protection.

This solution is particularly useful for post-accident repairs, body and paint corrections, or restoring the car to a condition close to factory-new. The original gloss black finish helps avoid differences in shade and texture typical of lower-quality aftermarket replacements.

Installation characteristics and fitment

The trim has been designed with a specific location on the vehicle in mind – the rear right side in the C-pillar area. As a result:

• the shape and profile are adapted to the factory body line of the Audi A4 / S4 B9,
• mounting holes and clips correspond to the original attachment points,
• there is no need for body modifications or the use of non-factory solutions.

The product comes from disassembly, which in practice means that it is an element with parameters consistent with factory standards, while at the same time representing an economical alternative to new parts. The used OEM component is a good choice for repairs where both quality and cost control are important.

Application in service practice

The gloss black C-pillar trim will prove useful in body and paint workshops, services specializing in the Audi brand, and for individual users who are independently assembling body components after repairs. It can be used both for local repairs of the side body section and for comprehensive vehicle restoration.

If you are planning a comprehensive repair or upgrade of the side pillar and glazing zone in your Audi and need other elements from the same group, such as covers, overlays, or additional trims, check the available parts in the Audi protective and decorative trims category.

Expert support when choosing used components

When assembling used body and equipment components, it is worth paying attention to the general condition of the surface, the mounting method, and compatibility with the specific model version. For users who want to better understand the specifics of purchasing parts from the secondary market for other vehicle systems, a guide on the fuel supply system may be helpful. Practical tips can be found in the article "Fuel dosing problems: what to look for when buying a used injection pump and fuel rails?", which shows how to consciously approach the selection of used components.