It does fit
2007 Audi A3
Crutchfield Customer Review (What's this?)
At first when you hold the stereo (in this case a single DIN Sony MEX-GS610BT) up to the mounting bracket it looks way too small to fit. It looks too narrow and too short. Don't panic, it does fit, and it fits well. The sleeve for the stereo slides right into the factory hole. Make your wiring connections then this plastic piece snaps in right over the radio and fits perfectly. The face for the radio is unobscured for removal and reinstallation.
Pros: Perfect, snug fit