they WERE made...there were only a certain number of each of the frames produced. And since the passing of Gan Well's master builder, Mr. Doi, I believe these EAI frames will no longer be made (this was under discussion from what I heard).
The last of the Nagasawa frames made for EAI that was at the EAI facility is a 57cm I believe. I am not sure if American Cyclery and BusinessCycles have "available stock" on the Nagasawas.

Both these runs of the Gan Well and Nagasawa frames were made ONLY for EAI (The Gan Well seat stay plugs were custom cut at the factory with "Euro Asia").
The story behind EAI and getting these frames made is pretty interesting. Mr Nagasawa was not accustomed to building "stock" frame sizes - this builder is truly a master and looks at rider measurements, riding style, velodrome dimension and specs - it is incredible how much data he absorbs and injects into each frame. He even treats tubes differently based on the season.
Intriguing to say the least.