The bumper consists of two main pieces, the front bumper surround (you call it apron) and the black impact strip. The impact strip is held on to the bumper surround with 4 screws and many plastic "ears", which snap into the bumper surround.

Like he said above, buy a new bumper surround, remove the entire front bumper, remove the impact strip and foam pieces from it, and then reinstall them to your new bumper surround. Install bumper.

I did that about a month ago. Find the online FSM to learn how to remove the bumper by removing six or so nuts, and two bolts. Remove the temperature probe first.