clips that hold plastic trim on roof

[zipdip]

Hi can anybody tell me if you can buy the plastic clips that hold the painted plastic strips that are on the roof of the W221 a couple of mine are broken ,has anybody got the part number,is there anywhere I can get them online,as going into the temple of mercedes main dealer and asking for a few clips which will mean waiting for a couple of weeks I hate having to ask the receptionist for parts and then a suited guy comes out and the merry go round starts