I’ve been trying to figure out the different types of fasteners used to attach the rear valence to the brackets at the top and base of the valence.

I just saw a survivor 70 Hemi Cuda with really long Philips taper-head screws and a loose washer attaching the valence at the bottom. See the first pic. I’ve also seen the lower part attached with the pan-head Phillips head screw with the washer attached, as in the 2nd picture. This screw looks to be the same screw that attaches the fuel neck seal to the trunk floor.

What have others found for the types of fasteners used to attach the valence? Does anyone have an example of the fasteners used on a 70 LA Build?