My '03 dually had a diamond plate toolbox installed across the front of the bed by the PO, and it left diamond plate scuff marks in the dark grey plastic bed rail covers. Looks kinda ugly.

Besides replacing with new stuff from the dealer, does anyone know if Putco or some other outfit makes some kind of rail protection/cover? My searches have come up empty.

No Problem, Diamond plate or smoth, my also have Black plastic- not 100% on that though, not always a stock item. Drop me a pm.