The bushings come int he control arms, but I am sure can be replaced. Unless yours are bent, I would think if anything you need bushings.
I had to replace mine on my 92 300CE, because one got bent in an accident.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.