Mercedes W221 Rear Triangle Quarter Window Glass Pane Left N/S A2217300720

Mercedes W221 Rear Triangle Quarter Window Glass Pane Left N/S is an original body component from the Car windows group, designed for installation in the rear left part of the vehicle body. Thanks to its factory-fit design, it ensures proper glazing geometry, body stability, and an aesthetic finish to the side profile of the car. It is a practical solution for users who want to restore full functionality and a cohesive look to their W221 generation Mercedes S-Class.

Specifications and technical data

• SKU: A2217300720
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2217300720
• Substitutable numbers: A2217300720, A 221 730 07 20
• Location on the vehicle: Rear, Left
• Category: Car Glass

Purpose and placement of the glass

The presented triangle glass is designed for installation in the rear left part of the body, within the side bodywork area. It is responsible for illuminating the interior, completing the window line, and providing proper reinforcement for this area of the body. Precise fitment to the W221 structure reduces the risk of stress, leaks, and unwanted noise while driving.

Technical and functional characteristics

As an element from the Car windows group, the side triangle works in conjunction with seals, the door or body frame, and other side windows. The appropriate geometry of the mounting edges facilitates correct seating in the body, and the proper profile ensures:

• a stable connection with body components,
• maintenance of the vehicle's factory side line,
• proper cooperation with seals and trim strips.

Choosing an original glass for a specific Mercedes model allows for maintaining visual consistency and performance parameters intended by the manufacturer.

Benefits of using an original side window

Using a dedicated triangle glass in the rear left part of the body translates into a number of practical benefits. The most important include:

• Factory fit – compatibility with the W221 body structure facilitates installation and reduces the need for additional modifications.
• Visual consistency – maintaining the original glazing line and the aesthetics of the side body section.
• Proper body rigidity – a correctly installed glass supports the side structure and helps maintain body stability.
• Compatibility with other elements – proper cooperation with seals, trim strips, and the window frame.

Component condition and service application

The offered glass is a used part, which makes it a reasonable choice for post-accident repairs, replacing damaged glazing, or restoring the car to full operational efficiency. Utilizing an original component allows for maintaining the parameters intended by the vehicle manufacturer while optimizing service costs.

Application in service and modernization practice

The rear left triangle side window is used both in body and paint repairs and when replacing individual glazing elements after mechanical damage. It is particularly useful in situations where it is necessary to restore:

• body tightness in the rear part of the vehicle,
• proper interior illumination,
• the original appearance of the side body zone.

If you are planning a comprehensive repair or modernization of the side glazing zone in your Mercedes and need other elements from the same group, such as side door windows, additional triangles, or fixed glazing elements, check the available parts in the Mercedes car windows category.

For drivers interested in a broader context of selecting used components and vehicle modernization while maintaining high technical standards, the article describing the evolution of a popular hot-hatch may be helpful – Hot-hatch legend: the evolution of the VW Golf GTI from Mk1 to Mk8 – design changes and VW car parts, which shows how thoughtful replacement of elements affects car operation.

If you want to better understand the importance of original components in the context of safety and durability, it is also worth reading the material on OEM part quality – Quality guarantee and OEM safety – why are used original car parts the best choice for your car?. This will allow you to consciously approach the selection of the side window and other body elements in your Mercedes.