Mercedes W221 Rear Panoramic Sunroof Window Glass Glazing AS3 Tinted

Mercedes W221 Rear Panoramic Sunroof Window Glass Glazing AS3 Tinted is an original, tinted sunroof glass designed for luxury S-Class sedans. This component ensures high travel comfort for rear-seat passengers, improves interior illumination, and maintains the factory characteristics of the panoramic roof. Thanks to the use of AS3 standard glass with factory tinting, the window effectively reduces interior heating and glare while maintaining the elegant appearance of the bodywork.

Specifications and technical data

• SKU: A2217801721
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2217801721
• Substitutable numbers: A2217801721, A 221 780 17 21
• Location on the vehicle: Rear
• Category: Car Glass

Purpose and function in the vehicle

The presented window belongs to the Car Windows category and is intended for installation in the rear part of the panoramic roof in the Mercedes S-Class W221 generation. Its placement in the rear roof zone means the component is responsible for:

• illuminating the rear passenger cabin,
• maintaining the continuity of the panoramic glass surface,
• proper cooperation with seals and the roof mechanism,
• maintaining the rigidity and tightness of the roof structure.

The original geometry of the glass ensures proper fitment to the roof frame and compatibility with factory rails and seals, which is crucial for maintaining tightness and preventing wind noise while driving.

Technical characteristics of the panoramic glass

The rear panoramic roof element in the Mercedes W221 is made of AS3 standard glass, which means the use of safety glass with appropriate strength and optical parameters. Factory tinting limits the penetration of sunlight, improving thermal and visual comfort for passengers while emphasizing the prestigious character of the bodywork.

Key functional features of this window include:

• optimized light transmission for the rear cabin,
• reduction of interior heating on sunny days,
• maintenance of proper structural roof rigidity,
• compatibility with factory panoramic roof mounting elements.

By maintaining the original specification, the glass works with the bodywork as intended by the manufacturer, which is important for both comfort and passive safety.

Condition, origin, and service application

The offered sunroof glass is a used component, which in practice means a favorable compromise between repair costs and maintaining the original manufacturer quality. This type of component is particularly useful for:

• post-accident repairs of the rear panoramic roof section,
• mechanical damage to the glass (cracks, breakage),
• restoration of premium vehicles where maintaining the factory look is essential.

Using an original window from the same model generation allows you to avoid problems with fitment, leaks, or improper adhesion to seals. This solution is particularly valued in professional body shops and for comprehensive body repairs.

Benefits of using an original panoramic window

Choosing an original rear panoramic window for the Mercedes W221 brings a number of practical advantages:

• Factory fitment – maintaining the correct geometry and curvature of the glass, which facilitates installation and minimizes the risk of stress.
• Consistent body aesthetics – identical tint shade compared to other panoramic windows in the vehicle.
• Acoustic comfort – proper adhesion to seals reduces wind noise and sound at higher speeds.
• Safety – maintaining the glass parameters specified by the vehicle manufacturer.

For owners of the S-Class W221 who want to keep the vehicle in a condition as close to factory as possible, using an original panoramic window is a technically justified and long-term beneficial solution.

Related categories and technical materials

If you are planning a comprehensive repair or upgrade of the roof zone in your Mercedes and need other elements from the same group, such as additional roof windows, glazing elements, or supplementary body windows, check the available parts in the Mercedes Car Windows category.

For a comparison of solutions used by different manufacturers and a better understanding of how structural changes affect the selection of glass and body elements, the article describing the evolution of a popular sports model may be helpful. More information can be found in the material: Hot-hatch legend: the evolution of the VW Golf GTI from Mk1 to Mk8 – structural changes and VW car parts.