83 Lower Grill Attachment?

[70GMCer]

When I took out the grille on my 83, I noticed that the bottom of the grille only had 1 screw in the middle holding the bottom in.

Is this the only screw that is in the bottom of the grille?

I would think that there would be other screws holding the bottom in.

There are 2 narrow slots located on either side of the grille as shown in the pic.

There aren't any signs of any clips ever being on there or any holes in the splash pan.

Any help on this???