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i own a 2013 c300 and i have been trying to remove the rear diffuser following the threads on the forum but i faced a problem since on the side of the diffuser there are supposed to be torx-20 screws but mine are different
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They are rivets. You need to drill them out, and then once you install the new diffuser you need to also install 2 new bolts and nuts to hold it into place. You can get the small bolts/nuts at Home Depot or Lowe's for $1 or so.