there are 6 interior lights, 2 map lights, 2 front door runner lights, and the 2 back seat lights. all 6 use the same 30x10mm festoon bulb. check out this website
http://www.superbrightLEDS.com
I bought the ones with 4 LED in white for the door runners and the back seat lights and the 9 LED for the fron map light. they are easy to change out, just use a flathead screwdriver to pop out the plastic casing over the bulbs.
They also have it in available in UV blacklights too which i wanted to use for the back seats, but itll bug me that it wont match the other 4 interior lights that i want to remain white.
the thing when you change the door runner lights, they are on (unless theres a way to shut them off while the door is open). So be careful not to burn yourself when popping them out and handling it.
I did mine this morning and it looks sweet!!