I'm guessing $60 to $80 to chrome it. I just did this yesterday, and I am still contemplating options- either paint or chrome. The bike will be a HOK kandy, and I'd do the tank the same, or contrast it with a metallic silver, or chrome it.
I've been using the same people for a long time, and I am always surprised at how much it costs. So I stopped worrying about it, and just figure if I want it chromed, I better really want it chromed. Here is a better shot of the mounts. I absolutely detest hose clamps wrapped around frames.