Genuine Mercedes-Benz Seat Belt Buckle Slide Stop Button Replacement Kit for All Mercedes-Benz, 129 860 31 69
PLEASE NOTE: This is shown by Mercedes-Benz to fit certain years and models, but this is a multi-fit type of part, i.e. it should fit any car, any year, any model, that has a seat belt.
This is a 2 piece kit with one side having a pointed pin to push through the belt, and a flat washer with a hole that fits on the other side of the belt and the pin locks into.
It must be located on the belt so that it does NOT stop the buckle from pushing into the seat belt correctly.
It does help keep the belt buckle from sliding too far down, making it hard to locate the belt.