65 Barracuda Trim Replacement

I finally got around to replacing this piece of trim below the rear window of my '65 Barracuda:

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I got a replacement with the car. Now that it's not too hot to crawl under that window, I discovered that the studs holding this in place aren't behind the black plastic caps like the center pieces, but instead they are behind another piece of sheetmetal on the inside:
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Zooming on the picture, those aren't hexes in the middle of those fasteners. Do they just pry out? I'm sure it's not too complicated, but I hate to just go in there with a pry bar and find out it's something different, but equally simple. And of course it's in a spot I can't get into to get a real good look. Bifocals suck sometimes!
Use a punch to pop out the center pin, and then CAREFULLY pry out the plastic rivet. Two thin putty knives work pretty good doing this. As mentioned, those plastic trim elbow pieces are about as strong as a potato chip, so, extreme care needs to be taken removing them. I'm not sure if anyone makes replacement rivets or just the pins. Sometimes those pins get lost when you punch them out into the body. What I did on one car was to use a tiny drill bit to make a short partial hole in the pin, then I used a tiny screw to thread it into that shallow hole. I then grabbed that screw and pulled the pin instead of punching it out. I then just turned the pin over when I re-installed the rivet and trim I was working on so that hole wasn't visible.