I did this about a month and a half ago. i drilled out the holes and glued the leds in place. Only did one per cup holder. Now you got me wanting to throw another one in them. hmmmm
and i got an eap center console and used the switch holes for my own toggle switch for these leds, and another one for my floorboard leds.
Tha Kraken: http://www.focusfanatics.com/forum/ford-focus-builds-general-showroom/285082-meet-kraken.html