Service and Repair Manual for Land Rover Defender L663, model years 2020-2024. Land Rover's new purpose-engineered D7x (for extreme) architecture is 95 per cent new and based on a lightweight aluminium monocoque construction to create the stiffest body structure Land Rover has ever produced. It is three times stiffer than traditional body-on-frame designs, providing perfect foundations for the fully independent air or coil sprung suspension and supports the latest electrified powertrains.