Nope you will need to get numbers 1, 2, 4 and 5. Numbers 4 and 5 is just the emblem, so if you don't want it, you don't have to get it. Everything else is just a matter of taking it off your DX and putting on the new grille.
This of course applies to 99-00 Civics, I don't know if it is the same for the 96-98 models.