Mercedes CLA X117 Quarter Glass Door Rear Right O/S Window Black A1177300455

Mercedes CLA X117 Quarter Glass Door Rear Right O/S Window Black is an original body component from the Car windows category, designed for installation in the rear right section of the vehicle body. The triangular side window provides stable reinforcement for the door frame, improves visibility, and maintains the consistent, factory look of the Mercedes CLA X117 side profile.

Specifications and technical data

• SKU: A1177300455
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1177300455
• Substitutable numbers: A1177300455, A 117 730 04 55
• Location on the vehicle: Rear, Right
• Color: Black
• Category: Car Glass

Purpose and function of the component

The presented window is dedicated for installation in the rear right door of the Mercedes CLA X117, in the form of a characteristic triangular window. It is responsible for illuminating the interior, improving visibility in the blind spot area, and maintaining the structural rigidity of the door frame. Thanks to its precise fit for the specific body model, the component works seamlessly with factory seals, trims, and door mechanisms.

Construction, color, and fitment

The window has a factory-defined placement on the vehicle: rear – right side, which eliminates the risk of error when selecting the component. The dark, black edge frame allows for an aesthetic connection with the door frame and body pillar, masking the adhesive and mounting elements. This type of finish is characteristic of modern Mercedes designs and allows for maintaining a consistent, dynamic look of the car's side line.

The original geometry of the window guarantees proper adhesion to the seals, which limits the risk of wind noise and leaks. As a result, after replacement, you can maintain acoustic and functional comfort similar to the factory standard.

Performance characteristics and installation

The component comes from the Car windows segment, which means it has been designed to work in variable weather conditions and under typical body operational loads. A used window is a cost-effective solution that also allows you to maintain the original character of the vehicle without the need for aftermarket replacements with uncertain fitment.

During installation, it is crucial to:

• thoroughly clean the contact surface in the door frame,
• use an appropriate bonding or mounting system consistent with the manufacturer's technology,
• check the even seating of the window relative to the seals and the body pillar.

This approach minimizes the risk of stress in the glass and ensures the proper operation of doors and locks.

Benefits of using an original rear right window

Using a dedicated triangular window in the Mercedes CLA X117 allows you to maintain the stylistic consistency of the entire side of the vehicle and the correct operation of adjacent elements. The main advantages include:

• Factory fitment – geometry consistent with the CLA X117 body design, with no modifications required.
• Aesthetic black finish – harmonious connection with the door frame and pillars.
• Door structure stabilization – contributes to frame reinforcement and vibration reduction.
• Savings while maintaining originality – a used component allows you to maintain the factory visual and functional standard.

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

Additional materials and technical knowledge

If you are interested in how the replacement of windows and other body elements fits into the broader context of modernizing cars of various brands, it is worth reading an article describing the evolution of a popular hot-hatch – Hot-hatch legend: the evolution of the VW Golf GTI from Mk1 to Mk8 – structural changes and VW car parts. You will find practical information there about selecting used components, which may also be helpful when planning work on your car.

If you are considering a wider renovation of an older Mercedes or another youngtimer using used body and glazing elements, you will also find useful tips in the guide The second life of a youngtimer – how used car parts rejuvenate cars from the 1998–2012 model years, where modernization scenarios using original dismantled parts are discussed.