I converted the rear passenger ashtray to a 12vDC charging station. This is a 1995 RRC, so same console/rear-ashtray as the Discovery 1.
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I just chose a dual port panel that offered the options I needed. To fill the voids on each side I used some scrap rubber sheet, 3/8" thickness in two layers. To clear the charger sockets a 29mm hole was required in the deeper layer and 38mm hole in the outer layer (to clear the threaded lock ring). I used 10-24 countersunk machine screws that pass through the rubber, and 10-24 nuts that each have a flat against the outer plastic wall. As the screws are tightened they compress the rubber, which in turn clamps the internal walls of the ashtray void - nice and tight!