Gauge light

I want to change the light inside my 96 integra gsr gauge cluster to a blue bulb but am not sure where to get the bulb and what # bulb to get. Is it pretty easy to swap the bulbs? I dont want to go the reverse glow route cause the white gauges look wak. thanks for the help

got mine from Auto Sonic shop in Arcadia, CA (jdmpartz.com) and they know what type of bulb I needed. Changing the bulb is easy as hell :)