I can get a hold of some JDM parts through the dealer that I work at. I have ordered those disks before without problems. I am also working with an aquaintance who lives in Japan so that I may be able to get more JDM stuff ( especially for the Legacy guys). I have the JDM parts catalogue for revision a, b, and c.
As for the caliper positioning on the bracket, I will talk to some of the techs in our shop and if I can, I will take measurements.
And yes, that disk is the vented 290mm x 18mm.