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Went to add this feature to my Ex and found that the 168 bulb type sockets I got are just a touch too small. Could probably add some glue and they would be fine but would rather have a socket that actually is more secure in the cut out opening in the door panel.
Search turned up nothing as far as what actual socket people have used to add this feature.
194/921 wedge base is what is in there from Ford. That said, don't put too high a wattage bulb in there or it will melt the surrounding plastic and base. I would stay under 12 watts, and I think I have 3 or 5.5 watt bulbs in there.