The only problem you might have is with the grey plastic fin that runs the length of the door and back panel.
The door has 4 holes drilled along it's bottom edge. The fin is attached by 4 screws that rust badly. I'm having to replace them on my S3 at the mo' coz they've started breaking and the fins are now starting to hang off.
The trailling fin that sits behind the door fin is secured up and under the rear panel of the body work. This might be an incompatible fit with an A3.
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