Fred, That color looks like it may be tough to match. When they anodize a piece of aluminum the first step is to immerse the aluminum in an acid bath then flow an electric current through it into the tank. This builds up an oxide layer that is reasonably durable and somewhat porous. For cosmetic colors they then dip the aluminum in a dye to impart a color then seal it in a boiling water bath. Obviously they need a tank of dye the color you need.
Typically most of the anodizing we do is black or clear (no dye). We also run red, yellow/gold and blue as needs arise. The anodizing shop we use could likely duplicate what you have, although it would take some work. The part would have to be stripped, re-polished and then masked to define the areas to be anodized. Then anodized and dyed in an appropriate color bath. Unlike tossing a few parts into a batch going out this one would cost money, I'd guess between $100-200 if they have to make up a dye batch just for that color. It might not be so bad if you had a few pieces to run...
Send me a close up photo of the color sometime with a piece of white paper in it for reference and I'll check on availability.
