Kevin,
Mine came with the boat as did the fittings. I can probably help you out with the fittings if you need (I work at a machine manufacturer with a 4 million dollar fab shop). I think the pole/spin was a dealer option when the guy bought the boat from Key Sailing. For finding the extrusion, try the Thomas Register (via yahoo). I've linked to this search for "Aluminum tubing" and you should be able to find someone near to you. It's not very expensive (about $4.50 per foot seems average) and some of them probably have coating options (anodizing). try here:
Company Listings Provided by Thomas Register