Smart Fortwo 451 Rear Bumper Lower Spoiler Centre Diffuser Cover A4516470084

Visual condition of the part

The product shows signs of use visible in the photos.

Smart Fortwo 451 Rear Bumper Lower Spoiler Centre Diffuser Cover is an original component from the Bumpers and reinforcements category, designed for installation in the rear part of the vehicle body. Designed specifically for Smart Fortwo 451 models, it ensures a consistent fit with the bumper, stable mounting, and an aesthetic finish for the lower edge of the vehicle's rear. It is a practical solution for users looking for a factory look and predictable installation.

Specifications and technical data

• SKU: A4516470084-1
• Mark: Smart
• Condition: Used
• OEM Part Number: A4516470084
• Substitutable numbers: A4516470084, A 451 647 00 84
• Location on the vehicle: Rear
• Part type: Bumper Reinforcement Beam
• Category: Bumpers & Reinforcements

Purpose and function in the vehicle

The rear bumper lower diffuser cover operates in a critical area of the bodywork, where components are exposed to dirt, water, and minor mechanical damage. Its purpose is to:

• complete the construction of the Smart Fortwo 451 rear bumper,
• stabilize the lower part of the bodywork in the rear zone,
• streamline airflow under the vehicle,
• aesthetically close the body line from underneath.

Thanks to the factory design, the cover works with the other rear bumper components, which facilitates installation and reduces the need for modifications.

Construction and fit for Smart Fortwo 451

The element was developed as part of the original Smart body system, which translates into predictable fitment with factory mounting points. The geometry of the cover is adapted to the shape of the rear bumper in the Fortwo 451 model, ensuring that the continuity of the line and proper adhesion to adjacent components are maintained after installation.

This solution is particularly beneficial for post-accident repairs or replacing worn-out elements when you want to maintain the original body structure without experimenting with replacements of uncertain fit.

Installation zone – rear of the vehicle

The cover is designed for installation in the rear part of the vehicle, in the lower bumper zone. This location requires an element with appropriate rigidity and shape to:

• maintain the correct position of the lower bumper edge,
• minimize play and vibrations while driving,
• ensure proper adhesion to other body components.

A properly selected lower diffuser cover helps maintain the factory geometry of the rear part of the Smart Fortwo 451, which is important for both visual and functional reasons.

Characteristics of the used component

The presented component comes from the used parts segment, which means it was previously used in a vehicle. These types of elements are frequently chosen for Smart Fortwo 451 repairs because they:

• allow maintaining the original body specification,
• are an attractive cost alternative to new components,
• ensure factory fit to the bumper construction.

Choosing an original lower diffuser cover from the secondary market is a sensible solution when you want to maintain the technical and visual consistency of the rear bodywork.

Technical support and additional information

Before purchasing, it is worth verifying the compatibility of the element with the specific version of the Smart Fortwo 451, taking into account the configuration of the rear bumper and the installation zone. If necessary, part identification data and information about the placement on the vehicle can be helpful, which facilitate the selection of the correct component for a given car model.

If you are planning a comprehensive repair or upgrade of the rear bumper zone in your Smart and need other elements from the same group, such as reinforcements, beams, or additional covers, check the available parts in the Smart Bumpers and reinforcements category.

To better understand why original components from the secondary market are increasingly chosen for repairs of premium and city cars, it is worth reading the article Crisis in the new parts market? Why used originals for premium cars are the hottest trend in 2026, which discusses the current realities of the automotive parts market.