It's a DE3175 festoon bulb.
Got mine here at superbrightleds.com. Fast shipping and great customer service.
Here is a link where you can find every bulb on your 4Runner.
http://www.superbrightleds.com/cat/...dels+with+daytime+running+lights-/62-138-19-/
These are what I have in there now (yes one on each side due to the rsa(rear seat audio) controller.
I also have one in the cargo area light but just isn't super super bright like I'd like it to be so I ordered this... Also if I like it I will get 2 more for the dome lights in the middle.
I got the warm white because I feel it accents the amber dash very well. Whereas all these people put blue or blue white just make it look not clean.
Trust me the one that has 4 LEDs is pretty darn bright. And I have some that have 6 smd LEDs on it for the map lights and 2 more LEDs makes a heck of a difference. I'm Almost scared to see just how bright the one with 30 high power smd LEDs will be. It should light up the whole entire cabin lol! These suckers are BRIGHT.
I also ordered some LEDs from another website a while back and had a problem with getting them to fade with the dome lights. All of these LEDs dim and fade like normal. In case that's a big deal to you just like it is to me. Lol
Good luck. Ill go take some pics of my LEDs if u want tomorrow night after I install the big boy in the back. Should be in mail tomorrow.
-Cody