@AuroraGirl is correct. So
@81squared, there will be things you'll ned to get, and things to get rid of to make this conversion back to an older hood style. I'll try to get some pics tomorrow of my hood, it has the hand lever to open it, and unless someone beats me to it and that's fine because we are trying to help a fellow trucksman, girl, do what he needs to get done. So it doesn't matter.
Speaking of the hood latch section, the kind that has the inside pull, is quite complex and has parts that bolt to the big center support in
@bucket's pics. So make sure you get some good photos of what you need before going off and then find out you missed something.
And as per you remark above, yes, that's what I was trying to describe about those slots and that is, that's where those plastic screw things go. You'll see once you are at that point that you will have to make some minor adjustments to those plastic screw things, and you'll see that once you tighten them down it holds the grill to one side or the other. Step back and look at it and you'll see that if they are over to far the grill won't be centered, that is, how close the edge of the grill is next to the headlight bezel. And the only way you'll know the grill is over to much to one side or the other is after you put the head light bezel on. If the grill is to close to one side you'll have to take the head light bezel off and then loosen up all the plastic screw things, maybe two and slide the plastic screw things over. And then put the head light bezel back on again. But be careful because, depending on how loose the slots are will determine how easy they slide over in the slots. You may have to slide them over by hand.
For something so simple can be a pain sometimes to get it right. Once centered it'll look right. You'll see.