Pillar B Cover Mercedes W166 Rear Right O/S Side Door Trim Molding A1666900487

Visual condition of the part

The product shows signs of use visible in the photos.

Pillar B Cover Mercedes W166 Rear Right O/S Side Door Trim Molding is a precisely fitted body component from the Doors and door panels group, designed for installation on the rear right side of the vehicle. The black side B-pillar cover allows for an aesthetic finish of the door edge and stable masking of the support structure, maintaining the consistent body appearance characteristic of the Mercedes brand.

Specifications and technical data

• SKU: A1666900487
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1666900487
• Substitutable numbers: A1666900487, A 166 690 04 87
• Location on the vehicle: Rear, Right
• Color: Black
• Category: Doors & Door Skins

Purpose and function of the component

The described rear B-pillar cover for the right side is designed as a finishing element for the door area in W166 series models. Its task is to cover the pillar structure, align the side body line, and ensure proper guidance of the door seal and trim edges. This ensures correct door fitment geometry and reduces unwanted wind noise while driving.

The black surface color facilitates integration with the factory door frame finish, allowing for a discreet yet visually consistent repair following mechanical damage or corrosion of exterior elements.

Construction, color, and fitment

The B-pillar cover is manufactured as a profiled side element, matched to the rear right side of the body. The shape and embossed lines are consistent with the factory body geometry, which translates into a secure fit with the door and adjacent panels. The black surface allows for maintaining a uniform aesthetic within the window frame and pillar area, without the need for additional painting in vehicles with a factory black finish in these zones.

The element belongs to the Doors and door panels group, making it structurally prepared for operation in an area exposed to frequent door opening and closing as well as varying weather conditions. A correctly installed cover stabilizes the side line and helps maintain the proper visual division between the window and the door panel.

Installation characteristics and application

The rear B-pillar cover on the right side is intended for installation in the rear part of the body, in the zone between the door and the pillar structure. The vehicle placement is clearly defined as rear – right, which facilitates the selection of the correct component during post-accident repairs or replacement of worn finishing elements.

As a used part, the element provides a cost-effective solution while maintaining original geometry and compatibility with factory mounting points. Proper selection of this cover allows for:

• restoring the correct appearance of the side body line,
• replacing a missing or damaged panel in the B-pillar zone,
• maintaining visual consistency with other door and window frame elements.

Application in repairs and upgrades

The element is suitable for both standard post-accident repairs and visual refreshing of the side body section in a Mercedes W166 series. Replacing a worn or scratched B-pillar cover helps reduce the visibility of previous damage and improve the overall appearance of the vehicle without interfering with the load-bearing structure.

If you are planning a comprehensive repair or upgrade of the door area in your Mercedes and need other components from the same group, such as side moldings, exterior panels, or additional covers, check the available parts in the Doors and door panels Mercedes category.

Technical support and vehicle development

For those who treat the replacement of body components as a stage of broader modifications or vehicle optimization, a wider perspective on the use of aftermarket components may be useful. In the context of conscious selection of used sub-assemblies, their impact on safety, and the cost-effectiveness of upgrades, it is worth reading the practical tips contained in the article Tuning with used parts – how to gain performance without spending a fortune.