From "Haynes Land Rover Diesel 1958-1985 (up to C registration
Disconnect the battery earth terminal and then the sidelight and headlamp harness at the snap connectors in the engine compartment.
Remove the securing bolts and lift out the mud-shield from under the wing. If working on the driver's side wing, remove the steering box mud-shield.
Using a socket wrench, remove the bolts securing the wing to the scuttle pillar.
Remove the bolts securing the wing and to the sill panel.
Remove the bolts securing the rear end of the wing to the upper mounting bracket
Remove the bolt securing the wing to the steering column support plate.
Finally remove the bolts securing the wing to the grille panel.
With an assistant, lift the complete wing assembly away from the vehicle.