My uncle acquired this 2013 MKZ and seems the plastic panel are pretty bad. We'll just finish installing the brake pads and black rhino truck wheels on the current Silverado project and we'll start working on it. Good thing the rust are not that bad.they are cheap plastic panels that pop out. My 2013 was the same way. I had a body shop paint them with the body matched paint. Looks great with the metallic shine now.