You should be able to find the bulbs at a good auto parts store. I replaced both the bulbs in the AC/Heater panel. The auto store bulbs were a touch wider at the base but with a firm push went into the socket.
To replace the bulbs in the AC/Heat panel you need to remove the knobs and then you will find screws under them. Remove the screws and just the very front part of the panel will come forward enough to change the bulbs out. I can't remember but I think I took the radio out of the way (take ashtray out and pull the trim gently from below and then pull gently on the sides, next remove two 10mm bolts holding the radio and disconnect the wiring, antenna)
Check out the link to get details on how to remove the dash cluster
http://www.cardomain.com/ride/748373/6