Name that fastener!

Anybody know what these fasteners are called, the ones holding the metal strip in place? I learned somewhere that you remove them by shoving a flathead screwdriver in between the two pieces. That causes the clip to pop open, but it breaks in the process. I want to take this strip off because the old headliner is glued in there, and I need to clean it off. But if I can't replace those clips, I'm kind of sunk. Now I can't find where I read how to remove them, because that thread probably talks about what they are called, and I've skimmed hundreds of photos of clips without any luck.

Help!