As James has said, mine is a genuine Renault part. It wasn't £400 quid though mate!!! I got it direct through r-sport and it was almost half the price of that!! I've got pictures of how I installed it I'll post up as it means I can remove it without being left with a gaping hole in the roof skin.
Yeah tried r-sports in London and the guy said £400ish for the vent, he's always reluctant to go check prices, I have bought parts there and he took my details, gave me a rough estimate and just charged correct amount to my card and sent an invoice. I don't know what there problem is there, you would think its not their job.....rant over!
It would be good to know for sure, but If tony has asked already then it's probably a no. I guess it's down to the scrut on the day too.
I
have seen a 205 that races in tintops (grey/black if I remember right) quite a handy thing, it dosent seem to conform, it has widened arches fitted, unless it's just the side silohette that counts :/