I've had some rust showing where the bottom cutout is where the towhooks would be. Used some turtle wax no7 crome polish and that did the trick. Hasn't been a problem since.
However the antenna base looks like crap, haven't done a good spring cleanup on the truck but hopefully that will do the trick.
just wondering if this is on the bumpers without fog light cut outs in particular or all the bumpers. I too like the sport models for this reason and wish I had one. Polishing Crome isn't my thing.