Just checked my car. I don't have the extra plates, just the sheet metal to the strut tower. I have never heard a clunk in my car, and I have 18" Ti wheels.
2012 Race Red 5-door SE, 18" Ti wheels, Ti headlights/fog bezels, 20% tint, debadged trunk
2002 Sonic Blue SVT - supercharged (sold)
2008 Vista Blue SE (gone)