On the question of "which one goes where" for the rear interior 1/4
1. the black one with the washer head goes at the bottom front, thru the carpet. Should be a hole in the quarter trim on the lower lip of the panel, can be tricky to find the hole in the body and line it up. A hot nail or small screwdriver can be used to melt a hole in the carpet at the right spot to ease installation and reduce binding of carpet on screw.
2. the short oval head goes under the handle (have seen black ones here as well, FAM calls out S9, zinc)
3. the pan head goes on the tab on the upper rear and holds the panel to the rear seat support. (have seen numerous cars where these are not used)
The FAMs are great references for this type of stuff, I'd strongly suggest getting a set and the AMK Guide To Ford Fasteners, as the two make identifying these types of issues a piece of cake (most of the time!). The FAM shows location and gives part number, the FAM allows defining the specific part when in question.
Can also be used to verify if existing fasteners are correct, or a PO "it fits"....
HTH