Search for “RTM mods” in google, does give you an good indication. Be aware I’m not doing any recommendations about these guys, all at your own risk and only for info.
But what specific car do you need, because lots have been made.
Hello Oliver, i saw that u are looking for a car with all the data included for Assetto Corsa. As a 3d modelist i might be able to help u.. Just name the type of car that u are looking. Regards, Zeroteam24