If you do go the zip-tie route, just make sure you use a good size (width) tie and one that's rated for outside and heat. Otherwise it'll just fall apart.
As for the clip, I've never had any luck identifying Ford (or any vehicle) stock body clips. If someone knows the magic key, I'd be happy to hear it. What I usually end up doing is either going to a good parts supplier that has a catalogue I can browse through, OR I make my own mounting using fabricated or aftermarket clips/brackets.
If it's broken, do the above. If it's just ugly, jam it back in there with excessive force and give it the finger.