Hi,
I just recently purchased a 2004 Crossfire coupe with 33K miles. It is a very well taken care of car. While going through the car I found 4 rubber plugs laying under the trunk floor near the jack. The part number on the plugs is 124 997 07 86. This appears to be a Mercedes Benz part number and Mercedes has it listed as a "Stop Plug" and also as "Plug, Side Member Front". I have looked under the car and I don't see where these 4 plugs would go. I have attached photos from a Mercedes website of the plug. I would appreciate any help you can give. Thanks.