Those are not legit NOS, they're Lauren Engineering reproductions, you'll notice no holes are drilled in any of the pieces, all my NOS air dam pieces are drilled.Appears legit, but as you say, it'd be more accurate to see the other side of the pieces. You'll need to have the reinforcement plates for the air dam side piece retainers as well.
Brackets are wrong too, NOS were black and had PNs stamped in them...