I used the Dashes Direct panels (I tried others from other manufacturers) and faced the same issues. As I recall I used an angled awl to open up the clip slots and used repro clips. Even then the clips were a fight to get installed on the panels but in the end that worked to my benefit as I could align them with the holes in the door on the workbench (I made a template of each door to align the clips on the panel with) and they stayed in place while installing the panel to the door. I did NOT remove material from the panels to install the clips as JD did.