Similar thread but not a lot of detail. I believe the 6 black phillips head screws and 6 metal panel nuts are to to mount the head lamp bezels (3 each per lamp). The panel nuts mount onto the grill itself.
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Picture from that thread
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The parts book is not real helpful either.
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I made this composite picture just now with grill pictures from my computer. You can see the panel nuts clip to the grill to receive the phillips head screw to secure the headlamp bezels.
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I found this thread just now.
After a few hours trying to figure out the correct parts for the grill from the kits available. (not on YouTube, in the Mitchell or Factory Manuals. I looked and I have the orginals bought with the car.) The plastic is there assuming you don't have the factory speed nuts. Pop them the hole above the square on the fender to radiator support and use the long washer screws in the kit.The screws also fit speed nuts.
Also this similar thread
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It appears to show where these pieces go at the top of the grill to the header panel? The header panel has slots under it that these insert to. Not sure about the screw that is used
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Not real sure about the remainder of the panel nuts and the bolts/screws.
The white plastic ones with the chrome screws are also a puzzle.