Changing high mount brake light on 4th Gen T4R?
 

My 3rd brake light went on on my 2006 4Runner and I am not sure how to change the bulb. I do not have the wing on the truck and I'm not sure if I'm supposed to pry off the actual light cover on the outside of the rear door. I can't see how to remove the bulb from the inside of the door, and I really don't want to break anything.
Also, according to sylvania.com, that bulb is a 921, autozone couldn't find the bulb size. Thanks guys.