Can you post a shot of the parts in question, and I can tell you what they are? I also posted a bunch of stuff on Xoutpost under the title "Panoramic Sunroof Deconstruct" that might also give some more info.
The vent grill piece is attached to the top panel on the rear.
The rear panel is the one that has some small plastic pieces that fit into a channel - the front one is connected to the innermost rail via the 2nd piece from the top in group #9
That piece connects the front panel via 6 small screws. That piece is also responsible for the action of cracking the 2 panels when the roof is in the vent position - it has a small slider system that makes that happen.
Last edited by salbol1; 11-10-2012 at 07:22 AM.