I am not certain, Rodd. I have seen these kits equipped both with and without the mounting bolts. I believe that those from the Mercedes mothership includes four bolts (108 990 08 01 x 4) and four washers (110 994 00 10 x 4), at a substantially higher cost than the aftermarket. I am not certain whether these are stretch bolts (torque to yield). If they are, replace them. If not, I would just clean up the threads and use a dab of Loctite.