Your pictures were great and they helped a lot. However, I have a problem - the small flat washer shown in the Mono Valve assembly sequence was dropped and lost. I went to the Mercedes Benz dealer to get one of the washers and was told that they don't have one nor do they know the dimensions of the small flat washer. Do you know what size the small flat washer is and whether you could find one? I need the inner and outer diameter of the washer plus the thickness and material type. Please advise.