I've found this small black rubber piece. It is mostly round like a Tootsie roll, has tiny felt on one side, straight grooves on the opposite side. There is an opening slit which makes it appear to get inserted onto something to act as a gasket most likely to protect something rubbing against something else. But I can't seem to find where in the world it may have come off. It was in the trunk so it has to be something related to the trunk lid, vario-roof, or perhaps the roof cover? Here are three low quality snap shots from my webcam. Can anyone tell? What should I do? My SLK still drives and I don't really notice much difference other than the normal creaks as she's gotten a little older. Could this have been used to help tighten up something so there was less creaking?