Yes it exist and I think it's the Pagani Zonda R Revolucion. The one available it's awful. I saw that someone is working on a series of Pagani but I can't say if them will be free or private for the modder only. He's working so hard to bring like a pack of Paganis but who knows. He's a good modder btw so the quality will be super!
For the sake of his work I can't pass you the bad Revolucion available... trust me, when a modder see the same mod he's working on but with 10 hours of work instead of weeks if not months of his own free time where he concentrate all of his energy to create a masterpiece well he feels disheartened.
Even the links for the Gran Turismo conversion, now you will see a lot od good models turned into ****boxes 'cause they will be a 10 hours work and a very few people that will work hard to turn that good models from GT series into masterpieces.
We all have just to be patience even when we see people/modders flexing around with some great pictures of these masterpieces 'cause they are still testing stuffs to reach the perfection for that mod.
It's too easy have a mod soon like some others that create mods of the most recent cars and then they ask you 60 euros for a bad conversion.
Let's be clear, I'm not a modder (at least not for now since I barely have a PC with which to play Assetto Corsa with 5 cars on the track, at most) but I put myself in the shoes of those who sacrifice their free time and put a lot, a lot of passion into it and then maybe see all their work go up in smoke for some newbie who is convinced he is Leonardo da Vinci!
I've spoken too much and I do not want to start a controversy about this.