I'm not sure that is a turbo that would be "stocked" by anyone. If memory serves, you ship your to Piers, they massage it and return it to you.
I could very well be wrong, but I think that's the way it works. You might PM Vaughn or call Piers directly. Another person to call is Michael at HotRodDiesels.com. He does a lot of Piers parts...
That's not very helpful, but maybe it will shed some light.
Andy