Land Rover Discovery Sport L550 Window Guide Glass Rear Left N/S FK72-255A63-AD

The Land Rover Discovery Sport L550 left rear window regulator is an original part of the window guiding system, designed for installation on the rear driver's side. It ensures stable window guidance within the door, limits play, and supports the proper functioning of the lifting mechanism and seals.

Specifications and technical data

• SKU: FK72-255A63-AD
• Mark: Land Rover
• Condition: Used
• OEM Part Number: FK72-255A63-AD
• Substitutable numbers: LR074803, FK72-255A63-AD, FK72255A63AD
• Location on the vehicle: Rear, Left
• Category: Window Seals, Gaskets & Trims

Purpose and Function of the Part

The left rear window regulator in the Discovery Sport L550 model is responsible for the precise guidance of the glass pane within the door frame. A correctly selected part:

• stabilizes the window while driving and closing the door,
• reduces vibrations and noise coming from the window area,
• supports the sealing of the window-seal system, which is important for acoustic comfort and interior protection.

Its placement on the vehicle (rear, left side) allows for unambiguous identification of the part's position in the body and simplifies selecting the correct part when repairing the rear door.

Construction and Body Fitment

As a part from the window seals and trim category, the regulator works in conjunction with the perimeter seals and the window lifting mechanism. Proper profiling and factory mounting points ensure:

• seamless integration with the door frame in the Discovery Sport L550,
• correct window guidance geometry throughout its entire range of motion,
• maintenance of factory assembly tolerances, which reduces the risk of jamming and uneven closing.

Its original Land Rover origin promotes compatibility with other door components, such as seals, trim strips, and the power window mechanism.

Condition, Service Application, and Benefits of Replacement

A used part is a good choice for door servicing when symptoms such as:

• cracking or knocking sounds from the window when driving over uneven surfaces,
• uneven window operation when raising or lowering,
• compromised sealing in the rear left window area.

Replacing the regulator with an original Land Rover component allows for the restoration of proper window operation without altering the door's structure. This is a service solution that helps maintain the technical and visual consistency of the body, which is particularly important in premium vehicles.

Integration with the Seal and Trim System

As a part from the window seals and trim group, the regulator works with other sealing elements, contributing to:

• reduction of air drafts at higher speeds,
• reduction of cabin noise in the rear left window area,
• protection of the interior from moisture in the rear door zone.

During service work on the rear doors, it is worth paying attention to the condition of the regulator, as its wear can accelerate the degradation of seals and cause uneven pressure of the window against the trim.

Compatibility and Part Selection

Manufacturer markings, including the OEM part number and available replacement numbers, allow for precise identification of the regulator in Land Rover catalogs. If in doubt when selecting, it is advisable to compare the vehicle placement (rear, left side) and product category to avoid confusion with parts from other doors or sides of the body.

If you are looking for other Land Rover window seals and trim, check out our dedicated category: Land Rover window seals and trim.

Support for Interior Upgrades

When working on doors and windows, many users also consider refreshing the cabin – replacing seats, steering wheels, or multimedia components with aftermarket parts. You can read about the practical aspects of such upgrades, part selection, and configuration examples in the article: Premium interior for half the price – used seats, steering wheels, and multimedia.