I have the M-Tech front air dam/bumper cover on my car. I had to remove everything in front of the radiator last month, including the core support, due to an unmanned SUV using my hood as a brake in November.
If I remember correctly, the pan had a bunch of screw holes around the edges and there were screw tabs along the bottom of the airdam and the bottom radiator support. Also the little corner triangles had screw holes that lined up along the sides. I would look, but it is dark and cold outside right now. I'll try to look tomorrow.
I do remember it went back together pretty easily, although I was worried with all the little parts in there. | 
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