With a limited-time event in Forza Horizon 5, you can try to get the classic American 1970 AMC Rebel 'The Machine.
How to Get the Reward
1970 AMC Rebel 'The Machine' is not the only reward in this event, but the most wanted one. To unlock it, you need to acquire 20 points, which can be earned only in the special Festival Playlist. The event will end on January 1st.
If you are already playing Forza Horizon 5, I don't think this will require extra effort. Play the game, have fun, and the points will come to you by themselves.