Okay, I fixed my oil leak and valve stem seals on my 260e, now I'm looking for something else to work on.

Sometimes when I hit a bump on the road I can feel a slight bump in the steering wheel. There is no noise and otherwise no shake in the wheel. I jacked up the car and checked the ball joints and tie rod ends and everything is tight except I get some visible movement from the idler arm. I noticed that fastlane sells bushing kits for the idler arm. Is this a common replacement item in the W124's?