1972 Grill/Turn signal confusion

We have a 70' Dart that had a 72' grill installed since we bought it. A recent accident cause us to replace the grill and some other items. My son likes the look of the 72 grill so we wanted to keep that.

My son found this grill and purchased it. My confusion is that the turn signal area is open at the bottom. It's not as if it is broken in that area, it's looks clean and as if it came that way. Is this a 72 Dart grill?

I'll also post pics of the original grill from when we purchased it.

Thank you

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