The window regulator is the mechanical assembly responsible for raising and lowering the door glass on the Land Rover Defender. This left-hand unit operates via a winding mechanism that translates rotational input from the window winder handle into vertical movement of the glass. A worn or seized regulator typically presents as stiff window operation, glass that drops under its own weight, or complete failure to move. Key Features Left-hand door fitment - confirm door side before ordering as left and right regulators are not interchangeable Mechanical winder-type regulator compatible with the Defender's manual window system Supplied to OEM specification under part number CVH500090 When replacing the regulator, inspect the winder handle, channel seals, and glass runners for wear as these components often deteriorate concurrently Vehicle Fitment This part fits the Land Rover Defender (all engines, Body and Chassis) from 1986 to 2006 for left-hand applications up to chassis number LA932487, and Defender 2007 onwards from chassis LA932487. Not sure about fitment? Feel free to get in touch at [email protected]