The rear trim piece are on the XLT's, but honestly if I were to do it over, I'd fill em in with metal, fiberglass filler to bring it close, and the use body filler/bondo to smooth it out.
IMHO if your gonna leave it level/small lift, fill it in, and get mud flaps. If your gonna lift it, with the biggest tires you can, use the trim. The trim actually goes down and around the bottom of the rear quarter, so it has some protection, and not just for looks. But the mud flaps give the same protection. Flaps wouldn't look right on a lifted truck.
Dana
BTW, ANYONE with this trim should look into this. Your doors are rotting before your eye's, and you can't see it. Look in his pics for how much dirt is held in there. Feel the edge of your doors along the bottom of the trim, if it's rough at all, she's rotting under it. I didn't save my doors, I'm going to have to replace them at some point. :doh:
Simply amazing someone at ford thought this was a good idea.