Mike, you found the piece. It fits together and you will be able to tell if it is right or left. The headlamp bezel(s) only go in one way as well and they are the ones that usually shrink. The grille(s) themselves will be marked left or right on the back side they usually say "R" or "L" on them. And if not, the even number is always right.
6 screws, 3 top, 3 bottom. There should be posts on the grille with the little metal caps on them.
If they are older and have hardened up, what I did to get mine back to fitting properly is this.
Boil a very large pot of water. Once it is boiling put the grey pieces, (the bezels) into the water and they will soften quite nicely and be very pliable again. Don't leave them in long or you will never get them back to shape. While the water is boiling get everything ready. Once you dip them you will only have a few seconds to get them in place and put the black section on, so practice first and do one side at a time.
Dip one side in the water for a few seconds, 10-15 then with tongs place it in the grille making sure everything is in it's proper slots. And put the back on. Don't tighten the screws too much but enough to hold it so when it cools, it will stay in place.
PM me if you need any further instruction or pics, let me know.
As you can see, mine came out fine.