Originally Posted by oldskewel

I've re-used mine. Just be aware that you can't use the same torque procedure (initial torque + angle after that) when you re-use them. You want to get back to the same amount of tightness without causing any more plastic deformation. If you were to use the same procedure multiple times you would certainly push it further into the deformation zone until it breaks.

On the radio, if it is still getting wet there, it is likely to be a problem with the hose leading from the left rear corner of the sunroof. Common problem on these cars, easy to test, easy to fix. Whatever it is, of course you should make sure the leak is fixed before replacing the stereo.