Nice pics, Waldo.
Just an FYI in case you cared....
The hex-head screw with a captive washer that you have in place on the rear-most top of the frame horns (holding the heat shield to the frame rails), is not the OEM-spec fastener for that location. Like the screws in the front of the heatshield, spec calls for a captive-washer T27 Torx (silver).
The (8mm) hex head fasteners are the OEM-spec to fasten the black screens together and to fasten the top screen to the car.
Just being picky, here. Threads on all of these is M6 x 1.0, so from that perspective they do inter-change without damage.