Section that has the metal sleeve is the only piece on the outside of the grille frame.

Basically it goes.
screw
spacer with sleeve
METAL GRILLE FRAME
thin washer
larger thin washer that snaps on the outer sleeve
Plastic grille that has the slide on clip nut

Hopefully this makes sense

I did 3 1968 Charger grilles last year and everyone where the same way
You might be able to zoom in on this picture