You need to edit the carmodel.layer (something like that) file, the mod may come with it or you may be forced to make your own using one line from the RB edited into the Ferrari. I recommend that you just find the tutorial by CW in this thread and work based on that
http://www.racedepartment.com/threads/f1-2016-modding-questions-thread.124753/page-35#post-2380192Still not working with the files from the mod which file is it? maybe I can get them from the red bull files