Often the manufacturer of the new radio will provide adapters if you go to their website. For an A3 you'll need to know if its ISO or Quadlock fittings. Look on the back of the old radio and google "Audi A3 ISO" and Audi A3 Quadlock" in Images to see the difference. Whether you have Bose or not makes a difference too.
And you'll probably need a CANbus adapter, the 12v power to the radio isn't switched by the ignition, the car sends a signal to the radio to turn on and off using the CANbus so you'll need an adapter to take the CANbus signal and switch 12v for the radio.
And you might need an adapter for the steering wheel controls if you have them, but I didn't bother.
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