I have not done one yet for an e53. Just e38 and e46. But console eject box is the same for the e46, e38, e39, e53 and e84/85. So the mod is the same for all of those models. Machine down the side rails of the console eject box by about 1/16th each side, then machine down the sides of the 3G snap in adapter to fit into the console eject box tray.
Craig