Taking On Water on Driver Side Under Floor Mat

[Sundown94]

UPDATE: Well I still have not put any silicone anywhere as of yet. But today, I opened up the sunroof and sprayed water directly into it. Nothing. Also, the water leak is not from underneath, because it leaks while sitting in my driveway. However, I did finally get it to leak when I sprayed water "near" the corner roof light. I know the rubber gromet makes a nice tight seal under that light, so I think that the leak is occurring under the exterior a-pillar body molding (that part that covers the driver's side edge of the windshield). I see that this piece is held in place with screws (maybe the leak is around these screws?), so does anyone know how to remove this molding? Also, I took the interior a-pillar trim off and it was nice and dry on the inside. I'm determined to get this fixed!!! :-)