The files contained in this package modify the ASR Formula mods to put the team's free cars in its respective manufacturer brand groups at the car selection screen.
Extract the compressed file contents to the main Assetto Corsa folder (defaults to %ProgramFiles(x86)%\Steam\SteamApps\common\assettocorsa).
NOTE: these files change the UI car selection screen only, it doesn't modify the IN-GAME car names, so it's online friendly, you will not get any data mismatches or be kicked when joining a server.