Mercedes ML 350 W166 B Pillar Cover Left N/S Top Panel Trim Black A1666904525

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes ML 350 W166 B Pillar Cover Left N/S Top Panel Trim Black is an original interior trim component from the Claddings, decorative strips and trims category, designed for installation on the left side of the W166 ML-Class model. The dark, black finish helps maintain a consistent look with the factory interior, and the use of an original Mercedes part ensures a proper fit and stable mounting.

Specifications and technical data

• SKU: A1666904525
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1666904525
• Substitutable numbers: A1666904525, A 166 690 45 25, A1666903300, A 166 690 33 00, A1666904101, A 166 690 41 01
• Location on the vehicle: Left
• Color: Black
• Category: Trim

Purpose and function of the component

The described B-pillar cover is responsible for the aesthetic and functional finish of the upper part of the left pillar between the doors in the Mercedes ML W166-Class. This component:

• masks the pillar structure and the wiring routed inside,
• visually organizes the side line of the interior,
• creates a consistent contact surface with door seals and upholstery.

Thanks to its precise profile, the cover ensures proper adhesion to the pillar, which reduces unwanted gaps and improves the overall quality of the cabin finish.

Construction, color, and fitment

The cover has been designed specifically for installation on the left side of the B-pillar in the ML W166 body, which guarantees shape compatibility with the body geometry. The black finish allows for a harmonious blend with the factory upholstery and other decorative elements, without the shade differences typical of generic aftermarket replacements.

The original construction provides appropriate mounting points and the correct rigidity, which facilitates installation and reduces the risk of subsequent rattles or looseness during vehicle operation.

Benefits of using the original B-pillar cover

Using the original cover in a Mercedes ML W166 brings a number of practical benefits:

• Factory fitment – the component is designed for a specific model, ensuring it maintains the stylistic line and correct alignment with adjacent panels.
• Consistent interior aesthetics – the black surface helps restore a uniform look to the cabin after damage or wear of the previous element.
• Stable mounting – dedicated clips and guides minimize the risk of vibrations and unwanted noises while driving.
• Professional repair effect – replacing a damaged cover with an original component allows you to maintain the finish standard in accordance with the manufacturer's specifications.

Characteristics of the used product

The offered B-pillar cover is a used part, sourced from vehicle dismantling. Such components are a popular choice for interior repairs because they allow you to maintain the original equipment specification on a reasonable budget. A used trim element usually blends in better visually with the rest of the cabin than a new part with a different degree of material wear.

An additional advantage is the environmental aspect – reusing original elements reduces waste and decreases the demand for the production of new components.

Technical support and ecology

In case of installation doubts, it is worth comparing the shape and mounting points with the currently installed cover in the vehicle, paying attention to the installation side and color. Selecting the correct trim element has a direct impact on user comfort and the visual consistency of the interior.

If you want to better understand how reusing original components affects the environment and carbon footprint, check out the article Sustainable automotive – why original used parts support ecology, which discusses the benefits of choosing parts from dismantling instead of new replacements.

If you are planning a comprehensive repair or upgrade of the interior trim area in your Mercedes and need other elements from the same group, such as covers, strips, or decorative panels, check the available parts in the Mercedes claddings, decorative strips and trims category.