The rs500 came in three colours. Diamond White, Moonstone blue and black.
White is correct but I’m not sure what the game is doing with the other two. The black looks grey and the moonstone blue looks way out too.
Also although Ford is American the car is essentially British.
European Fords were made in England, Germany, Spain and Belgium, which built Sierras. Turkey builds Transits currently but I don’t know if they consider themselves part of Europe. Australia built Falcons, South Africa builds Rangers, Canada built Crown Vics. According to Forza, they’re all USA, but GM subsidiaries get their local nationality, even Vauxhalls built outside UK. [shrug]