I had interference with the blue ones. Under compression the arm would contact the sway bar which in turn would force the sway bar up into the seam of the frame. I got some slight contact with the speedybenz arms as well but I lifted the rear until it stopped. I believe the concept should be to cut out a section of the stock arms and weld in an adjuster of some sort. The major problem is where the sway bar passes over the top of the camber arm ... unless you go even lower than my car. The K&W coilover instructions mention the necessity of notching the frame for clearance if you go really low. That must be for the swaybar. The lower the car the closer to the frame it is.

Les