First, welcome to the forum! Vehicle suggestions belong here: https://www.beamng.com/threads/vehicle-suggestions-see-first-post.79/. Due to copyright laws, the devs cannot add any licensed vehicles to the game. You can suggest a fictional car based on a mustang.
Honestly I really wouldn't mind the Foxbody Mustang in BeamNG even as a lore friendly brand. I feel like this is what the developers are missing from the game. A muscle car that isn't too old and isn't too new. Not to mention I don't think we have a car that was made by Gavril or Bruckell that was made during the gas crisis era.
