Audi R8 42 Door Window Quarter Triangle Cover Trim Right O/S 420837638

Audi R8 42 Door Window Quarter Triangle Cover Trim Right O/S is a precisely fitted body component responsible for the aesthetic and functional finishing of the passenger-side mirror area. This original triangular cover helps maintain a consistent door appearance, limits the ingress of debris around the mirror mounting point, and improves acoustic comfort inside the cabin.

Specifications and technical data

• SKU: 420837638
• Mark: Audi
• Condition: Used
• OEM Part Number: 420837638
• Substitutable numbers: 420837638, 420 837 638
• Location on the vehicle: Right
• Part type: Trim Strip
• Category: Trim

Purpose and function of the triangular cover

The described cover is a component mounted on the right side of the front door, in the area where the mirror meets the window and the door frame. Its tasks include:

• covering the mirror mounting structure from the interior or the outer edge of the triangle,
• streamlining airflow around the mirror, which can reduce noise at higher speeds,
• aesthetically closing the line of the door and window, without visible structural gaps.

Thanks to its proper profile, the cover works in harmony with the window, seals, and mirror housing, creating a cohesive, technically refined system.

Compatibility with Audi R8 42

The component has been designed specifically for the Audi R8 42 generation, which means maintaining factory geometry and mounting points. In practice, this translates into:

• secure fitment to the shape of the door and window frame,
• proper adhesion to the mirror base,
• no need for modifications or forced fitting.

Such a solution is particularly important in sports cars, where the precision of body panel fitment affects not only the appearance but also the comfort of use.

Construction and role in body finishing

The cover belongs to the Trims, decorative moldings, and decorations group, which are components responsible for the visual and protective finishing of the bodywork. In the case of the Audi R8 42, it performs several important functions:

• masks the sensitive mirror mounting area,
• protects against minor debris and moisture,
• complements the sporty door line, maintaining the characteristic style of the R8 model.

Thanks to the use of an appropriate profile and material, the cover works well with other finishing elements, which makes it easier to maintain a consistent look for the entire right side of the vehicle.

Condition, origin, and advantages of using a used part

The presented cover comes from the original Audi line and is offered as a used part. In practice, this means it retains factory fitment parameters while providing a cost-effective solution for post-accident repairs or replacing worn-out finishing elements.

Using an original, used triangular cover allows you to:

• maintain visual consistency with other body components,
• preserve factory lines and gaps between the door, window, and mirror,
• reduce costs compared to purchasing a new component while maintaining proper fitment.

Support with selection and expansion of the finishing zone

If you are planning a comprehensive repair or upgrade of the door and mirror finishing zone in your Audi and need other elements from the same group, such as covers, moldings, or decorative overlays, check out the available parts in the Audi Trims, decorative moldings, and decorations category.

For users interested in deepening their knowledge about selecting parts from the secondary market, OEM compatibility rules, and practical assembly checklists, the guide in our knowledge section may be helpful: BMW B58 code – checklist before buying a turbocharger and intercooler. Although it concerns a different brand, it well illustrates the approach to verifying part numbers, fitment, and the quality of components used in premium class cars.