The C320 is a W203 platform. The Crossfire is based on the R170. Those steering components will not interchange.
A SLK320 will be okay.

The above picture is the center link with the left and right tie rods. Those parts are what I quoted above in post #2. The units (center link and tie rods) come complete, but the idler arm would be additional and the idler arm bushing can be replaced individually. The Idler is on the right side and the pitman is to the left