any volvo dealer has the wheat-grain bulbs although they can be expensive.

that one on the sunroof switch is especially irritating because it's in a plastic holder that slides into the sunroof switch assembly and often the plastic notch or whatever that holds the plastic holder into the switch breaks and then the holder/lamp won't stay in the sunroof switch. You can glue the holder in the switch once...I don't know what to do the next time the bulb burns out (I'll cross that bridge when I come to it) other than replace the entire switch assembly, probably $100.