How is the cab molding attached?

[Gibson]

After what ECU mentioned, I went to Pull-A-Part and found some trim in perfect condition (thank for the tip). The corners were a pain - I could figure out how to get to that speed nut. Didn't seem to be anywhere that I could reach in. I used an old butcher knife to slide carefully under the corner trim and pry up enough to pop it off of the metal clip it was on (I'm assuming the other side of that clip has the aforementioned nut). Then the rear piece slid off sideways with a little coaxing. For some reason the other corner was easier to get off. Now I just have to hunt down those clips from LMC!

Thanks for the tips everyone!