Ford Fiesta Mk5 ST Rear Bumper Diffuser Trim Lower Spoiler Black 5S6Y-17D781-A

Visual condition of the part

The product shows signs of use visible in the photos. Ford Fiesta Mk5 ST Rear Bumper Diffuser Trim Lower Spoiler Black is an original body component from the Bumper inserts and covers group, designed for installation in the rear part of the vehicle. Specifically engineered for the ST version, it improves the aerodynamics of the rear area and gives the car a more dynamic, sporty look.

Specifications and technical data

• SKU: 5S6Y-17D781-A
• Mark: Ford
• Condition: Used
• OEM Part Number: 5S6Y-17D781-A
• Substitutable numbers: 5S6Y-17D781-A, 5S6Y17D781A, 1359944, 5S6Y-17D781-AA55MW
• Location on the vehicle: Rear
• Part type: Bumper Insert
• Category: Bumper Inserts & Covers

Purpose and function of the component

The presented diffuser is dedicated to installation in the rear part of the bumper, where it serves as a lower edge cover and a component that shapes airflow under the car. Thanks to its fitment to the body lines of the ST version, it ensures a consistent appearance with the factory styling package and stable mounting at the original attachment points.

Construction and fitment for Ford Fiesta Mk5 ST

The element has been developed as an OEM component, which means its geometry, mounting method, and profile are consistent with the manufacturer's factory specifications. The rear bumper cover in the form of a diffuser is profiled to:

• precisely adhere to the lower part of the bumper,
• maintain appropriate rigidity during operation,
• reduce the risk of air catching under the bumper. The black color of the diffuser blends well with both light and dark body paints, emphasizing the sporty character of the ST version without the need for additional modifications.

Benefits of using an original diffuser

Using an original rear diffuser in the Ford Fiesta Mk5 ST allows you to maintain the factory body line and proper fitment of the components. Key advantages include:

• secure fitment to the bumper without the need for modifications,
• maintaining the consistent styling of the ST version,
• preserving proper airflow in the rear part of the undercarriage,
• the ability to use existing mounting points. For users who care about maintaining the original look and aerodynamic parameters, choosing such an element is a technically safe and predictable solution in operation.

Condition, installation, and service application

The diffuser comes from the secondary market, which allows for an economical repair of the rear part of the body after parking damage or collisions. The element is particularly useful in situations where there has been:

• cracking or deformation of the lower part of the bumper,
• wear or damage to the factory diffuser,
• a need to restore the original look of the ST version after modifications. Installation in place of the factory element is simpler than adapting universal replacements, which reduces service work time and the risk of fitment issues.

Repair expansion and additional information

If you are planning a comprehensive repair or upgrade of the rear body area in your Ford and need other components from the same group, such as additional covers, inserts, or lower bumper trims, check out the available parts in the Ford bumper inserts and covers category. If you want to better plan your post-collision repair and consciously select original used components, our guide article may be helpful: Repairing a car after a collision using original used OEM parts, where you will find practical tips on the safe and cost-effective selection of body components.