In this video Adam Clift, Carisma Team Driver, shows us how to the LED kit for the Range Rover Classic shell. They are a push fit into the light buckets, and then simply require the front grille bolting on and the rear buckets fitting using double sided tape (included with the clear shell).
For the perfectionists out there you can also paint the rear of the LEDs with black model paint (acrylic is best to safeguard the shell) this avoids light leaking into the shell iteslf.
Source: www.carisma-shop.com