Here is a pic
it's off a mk4 jetta but the same idea.
It's from a list of random stuff that I have yet to organize.
Theres a how to on tdiclub but it tells you to pull the entire panel off, this is not necessary, just pull the center handle off.
there's a green optic plastic that makes it glow. Unfortunately, an LED won't work well here because of the way light reaches the green plastic. It's work but it won't be an improvement or it'll be worse. The reason why is because LEDs don't illuminate the plastic in all directions, they work mostly in 1 direction or a thin 360 degree pattern.