is the bezel actually damaged? that's a moulded piece of plastic, what broke?
there is a TSB about a buzz/rattle from the door panels when using the radio/CD player at elevated volumes or bass levels or voice broadcasts.
TSB
07-17-6 BUZZ/RATTLE FROM DOOR PANEL WHEN OPERATING AUDIO SYSTEM - VEHICLES BUILT BEFORE 8/2/2007
Some 2005-2008 Mustang vehicles built before 8/2/2007 may experience a buzz/rattle from the door panels when using the radio/CD player at elevated volumes or bass levels or voice broadcasts. This may be due to the window switch bezel vibrating against the door trim panel. This can often be incorrectly diagnosed as an audio speaker buzz or a bad speaker.
1. Remove window switch bezel from door panel and separate the two piece bezel.
2. Install three (3) pieces of PVC soft foam tape 3/8" wide by 1 3/4" long (10 mm by 45 mm) part number 164-R4901 from the Rotunda Squeak and Rattle Repair Kit part number 164-R4900. (Figures 1 and 2)
3. Reinstall window switch bezel and verify proper operation of the window switches.