hi and welcome to the club
did you buy the D3 from a UK dealer or Spanish, if UK i am suprised that the lights and plaque were not intact on delivery if spanish it would follow that they removed them but should have included them with any kit already in the vehicle, i.e jerry cans tow ropes or first aid kit, extra spare wheel.
the good news is that plaques and stickers should be available from the club as they were given a stash at eastnor.
fitting the lights would be a competent auto electrician due to the routing and relay / operation of the lights again your local culture may dictate otherwise.
an uptodate copy of LR Rave cd should have the wiring diagram if not a further shout to the forum here or at www.disco3.co.uk should get the info you need
regards
martin 2003 Stage 3 Event Vehicle
D2 V8i ES
Founding Chairman G4 Owners Club