Interior Lamp
12v, 5 Watt festoon made by Sylvania. Should be able to get them at any auto parts place. Just checked Pelican and they have them- $1.50. It's the same bulb for the glove box and license plate.
Since they also go by length- measure yours.
Orrrrr... go the bling route with the new LEDs. Blue, red... etc. Online.:-D