Ken,
The end of each ski rack has two hinged devices that attach the racks to the metal garnish moldings on the hard top. These are pretty solid items and generally are in better shape than the hollow chrome bars. The ends screw onto the bars so they can be removed so that the bars could be refinished. The ends cannot be refinished, but generally don't need refinishing.
The items on the bars that hold the skis to the rack have some metal grommets that rust, as do the metal clasps. I think these would be difficult to redo.
Best,
Tom
1971 280sl Tunis Beige Metallic (restored & enhanced)
1971 280sl Tobacco Brown (low mileage stock)
1970 280sl Deep Red (Project Car)