The main seal is a hydraulic piston seal, which according to the Land Rover forum is the same one that is included in the genuine LR kit, at a price of £150.00! The cheaper kits have na ordinary oil seal, which is not any good. So here is the special seal installed in the box, with the washer and circlip. The second oil seal goes in after this.
Then the shaft can be re-fitted into the box.