Dholbr10

Hi All, Any help much appreciated. Recently driving on the motorway, a flying number plate hit the front drivers side of my A4 and knocked the parking sensor into the bumper. Checked it out yesterday, it's all still connected and still work fine, looks like it's missing the housing/bracket, any suggestions on getting one? I have contacted Audi direct but they are closed at the moment. See attached photo of passengers side, fully intact, drivers side is missing the 'outer circle' thanks David