I bought a Mk2 Ph1 Foglight kit with all the wiring, relays, stalk, fogs etc off ebay for £60 + £10pnp.
Believe me, looking at the contents of the kit i got theres more to this than merely "plugging in some existing cable". The instructions that Renault supply are also clear as mud, ive seen Lego instructions more in depth than this.
If its any help i guess i could scan them in for you but i doubt its going todo much good. But at least you will get an idea of parts/part numbers of whats needed the official way?