Those are regular dome light bulb.. you can get that in almost any motor sports shop or online..
www.autodynamic.com
But for people with moon roof.. you need to get different one....
I was down at LA last weekend and pick up a pair..
Hmm from the box.. it's made by Polarg.. where it's sold every where.....
Let's see.. model...
M-26
P8716W
12volt 8watt
It's hyper white.. it's bright... I've had purple for while... with that can't see anything....
But now.. it's bright I can see stuff inside.. I think they also have blue... red.. etc...
Just think of it as small blinker bulb...