Hey, welcome to BC.
I have the 8 button setup in my 2001, but bulbs are bulbs. i took mine apart last week and checked it out, everything is sodered into the circuit board. Melt the existing soder, then put a new bulb in and call it a day.
As for buying the bulbs, try ebay first. I forget the name of the website, hopefully another member can remember.
Oh, and be careful, these things are expensive. A new one is $365 from the dealer, and thats just the single climate control.