You have to rezexplode one of the game's brzs in the data folder. I don't have FB, but there are usually a few brzs there ending with a, b, or c. The vehicle textures are in the brz that comes last. Just copy that file and paste it in the mod tools>rezexplode>input folder. Then run the rezexplode exe. It will create an exploded folder that will have all the files that are de-brzed.