Mate, I knew someone would ask! For that very reason I took a couple of photos of the way the rings are fastened into the panel.
This shows where the little tabs are that hold the rings in place. There are two top and bottom and three on each side.
And this is a shot of the panel with them removed. (Excuse all the red dirt)
To remove them I used some plastic trim removal tools I picked up at an auto parts store. I used a large/wide flat one to slide in the bottom then a smaller/narrower one to work out each tab on the sides.
Once I had one out it was easy to do the rest.