The full line of Hammered Rustoleum paints are available at my local WalMart stores in North Texas. You might try there.
Be sure to search the forum for advice on painting with this stuff. There are several good threads on it. Use the keyword "hammered". I just don't have the time right now to find them.
My Goldie has been painted for a couple of months now and after just handling the parts, not even running the machine, the parts that I used self etching primer on before paint are not fairing as well as those that I didn't prime. I'm getting flakes and it chips easily over that primer. But I'm using Hammered Gold and Hammered Copper. There may be a bit of difference in adherence depending upon the tint. The instructions on the can say no primer.
Definitely test it on some cardboard before you start applying to the metal to get a feel for it. It took me four cans of gold and two cans of copper. The greenie has more green than the goldie has gold, proportionately, so it may take you a different ratio. Maybe five green to one silver but if I were you I would get two cans of silver for that headstock.
Good luck and post lots of pictures on your own thread. Here's
mine.