Not trying to be an ass, but why would you want this? Also because you could just get the cars they seem to be based on.
Such as the 9F looks like one of those high-end Audis, and the Hellenbach looks like the recent Camaro. The other ones definitely look familiar from real cars as well, so I would just look for those. I mean, I wouldn't bother to replace the generic cars from GTAIV with generic cars from GTAV.