I recently did the same front subframe job on my 560SL. The clips are used on some Mercedes models to prevent the rotation of the winged nuts. Apparently the kit works on other M-Bs. I to did not find the clips in my car, nor did I need them. The only strange thing that I encountered was that a couple of the slotted "windows" in the chassis, that the winged nuts go into was too narrow for the new parts, so I used the old nuts there. I guess I could have ground them down.

When complete, you will not believe the difference in the way your car handles and rides! Good Luck