Maybe a retarded question since i have not yet tried to even remove the door panel - but are they part the door panel or is it attached separately? If so does it just pop off? I am debating putting my tweeters in either this location or in the vents. I haven't decided yet but I don't mind drilling the plastic triangles as I like this look (my X5 is like this) and I would think would be easy to order new ones if I ever changed my mind. Thoughts?