Mercedes W204 C207 Panoramic Sunroof Sliding Roof Middle Window Glass Panel AS3

The Mercedes W204 C207 Sunroof Roof Glass AS3 is an original body part from the Mercedes group, designed for vehicles equipped with a panoramic roof. This is a solution for users who want to restore the full functionality of their sunroof while maintaining factory fit and aesthetics compliant with manufacturer standards.

Specifications and technical data

• SKU: A2077800121
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2077800121
• Substitutable numbers: A2077800321, 7800321, BG
• Category: Other Exterior Parts & Accessories

Technical characteristics of the AS3 roof glass

AS3 type roof glass is a component with enhanced performance parameters, designed for driving comfort and safety. The construction of this component ensures:

• adequate resistance to dynamic and static loads within the roof area,
• stable operation of the sunroof mechanism under typical operating conditions,
• proper sealing in conjunction with the frame and factory seals.

By maintaining the geometry consistent with the manufacturer's design, the glass works with the factory guide mechanism and roof cassette, which facilitates installation and subsequent adjustment.

Application in Mercedes W204 and C207 models

The presented sunroof glass for Mercedes W204 and C207 has been developed for body styles equipped with a panoramic roof, where precise fit with the bodywork and interior elements is crucial. Using an original solution allows for:

• maintaining the factory roofline and proper adhesion to seals,
• preserving the correct operation of the tilt and slide functions,
• minimizing the risk of leaks after proper installation.

This is particularly important in premium vehicles, where acoustic comfort and bodywork sealing directly impact the perceived quality of the ride.

Condition of the part and benefits of choosing a used part

The offered component comes from the used Mercedes parts segment, which significantly reduces repair costs compared to purchasing a new part while maintaining the factory construction. For many users, this is a sensible compromise between quality and budget, especially for body and glass repairs.

Choosing an original used roof glass also means:

• maintaining compliance with factory safety standards,
• easier fitting to the existing cassette and guides,
• reducing the risk of installation problems typical of some aftermarket parts.

Integration with other body elements

The sunroof glass works with the roof frame, seals, and sliding mechanism, so it is important to use a component with the correct specifications. A properly selected component allows for:

• proper water drainage from the sunroof gutters,
• stable panel guidance throughout its range of motion,
• a cohesive exterior appearance of the vehicle, without differences in shade or shape.

This ensures that repairing a damaged sunroof does not negatively affect the ergonomics of use or the visual appeal of the car.

Selection and other products in the category

If you are also looking for other elements in the Other Mercedes category, check out our offer, where you will find a wide selection of body, interior, and accessory components: other parts from the Other Mercedes category.

When planning repairs and upgrades, it is also worth familiarizing yourself with technical materials regarding the structural differences between sports and standard versions – a good starting point is an article comparing solutions used in higher-class cars: Audi RS vs other models – what lies under the hood and chassis?.