Got both front and rear.They came from S203 and S204. Its a bar with a damper. I use to have sold rear strut bar and their is a difference from these S series stuff. With a solid bars it feels the car snaps when your sliding it. With the S series bars feels like a much smoother shift and doesn't snap.
Also eliminated suspension noise while driving and makes big bumps not as bad. Great bars. Front one is actually starting to be very common. The rear one is really rare