If you remove the black fibreboard from the underside of the dashboard (about 10 small phillips) all will be revealed if you don't fancy taking out the dash itself.
LED's are a push fit in the plastic housing (normally translucent) they have a shoulder which locates the correct height of it.
If you do decide to extend the leads you need to observe the correct polarity, no damage will occur if you cross them over it just won't illuminate until you get it right.
