Ford Focus MK3 Front Door Window Trim Weatherstrip Outer Black Left N/S 1871579

Ford Focus MK3 Front Door Window Trim Weatherstrip Outer Black Left N/S is a precision body component responsible for the seal and aesthetic finish of the window edge. The original Ford design ensures proper window guidance, reduces cabin noise, and provides protection against water and debris. It is a practical solution for users looking to restore the correct operation of the window mechanism and maintain a consistent look for the side of the vehicle body.

Specifications and technical data

• SKU: 1871579
• Mark: Ford
• Condition: Used
• OEM Part Number: 1871579
• Substitutable numbers: 1871579, BM51A20563AH, BM51-A20563-AH
• Location on the vehicle: Front, Left
• Part type: Window Trim
• Category: Window Seals, Gaskets & Trims

Purpose and fitment

The presented weatherstrip is designed for installation on the front left door of the third-generation Ford Focus model. The vehicle placement is engineered to fit precisely against the edge of the window and door frame, which facilitates installation and ensures a stable fit. Thanks to its factory profile, the trim works seamlessly with the factory window lifting mechanism without causing additional resistance or stress.

Sealing function and window protection

The trim belongs to the Window seals and trims category, responsible for the tightness of the window area and protection against external factors. Its tasks include:

• limiting the ingress of water and moisture into the door interior,
• reducing cabin noise by sealing the space between the glass and the door panel,
• protecting the edge of the glass from minor mechanical damage,
• stabilizing the window movement during opening and closing.

The black, outer profile of the trim blends well with the body line, ensuring a consistent, factory-original look for the side of the vehicle.

Characteristics of the original Ford component

As a Ford brand product, the trim has been manufactured in accordance with the vehicle manufacturer's requirements regarding shape, dimensional tolerances, and mounting method. This means:

• a secure fit to the door and window edge without the need for modifications,
• preservation of factory gaps and body lines,
• compatibility with original mounting points in the door.

As a result, this component can be used both for standard replacement of a worn seal and for post-collision repairs, where restoring the original door geometry is essential.

Condition and service application

The item is offered as a used part, which allows for economical repair while maintaining the manufacturer's original specifications. This solution is particularly beneficial in cases of:

• replacing a seal after mechanical damage or window removal,
• limiting water ingress into the door after corrosion or wear of the old trim,
• restoring correct window guidance after bodywork repairs.

Selecting the correct component is facilitated by the OEM marking and available replacement numbers, which allow for verifying compatibility with a specific body version.

Support in part selection and additional information

If you are planning a comprehensive repair or upgrade of the window area in your Ford and need other components from the same group, such as additional trims, guide seals, or window edge finishes, check the available parts in the Ford window seals and trims category.

When choosing between new parts, replacements, or used parts, it is worth analyzing the cost-to-quality ratio and fitment for a specific vehicle – this is discussed in more detail in the article Original, replacement, or used – which car parts are the most cost-effective?, where you will find practical comparisons and answers to the most common driver questions.