The window regulator is the mechanical assembly responsible for raising and lowering the door glass in response to the window switch. On the Discovery 3 and Range Rover Sport, regulator failure typically presents as a window that moves slowly, operates intermittently, or drops into the door and will not raise. Fitting the correct side-specific regulator is essential, as left and right units are not interchangeable due to differing cable routing and motor mounting positions. Key Features Right-hand (RH) door regulator, specific to the front or rear door assembly on affected vehicles Direct OEM-equivalent replacement requiring no modification for installation Applicable to vehicles within the specified VIN range: from 8A449289 up to 9A999999 When replacing the regulator, inspect the window motor and door seal for wear, as these are commonly replaced at the same time Vehicle Fitment This regulator fits the Discovery 3 (2005–2009) and Range Rover Sport (2005–2009), right-hand application, within the specified VIN ranges as detailed in the fitment data above. Not sure about fitment? Feel free to get in touch at [email protected]