rear light fixings

[Duff3103]

Hi guys since owning the a8 i noticed the rear lights weren't sitting properly and flapped about, one had to be replaced due to the led's being faulty (moisture in the unit) but its clear both have been out previous and to me it looks as if there is something missing to hold them properly in place, does anyone have a photo of what nuts bolts fixings holds the rear light in place? (the illustration from the dealer isn't clear) thanks