That is line with what cardin555 said(thanks for the info cardin.)
I knew the Imprezas and Foresters by 99 had the new style but was unsure about the Legacy/OB. So it does appear, unfortunately, for Legacys/ OBs that 2000 is the first year guaranteed to have the new bracket. Of course they also already have the larger rotors, so again a moot point. Except when being viewed from the parts car perspective.
So the next step is again gonna be to see if the old caliper will work with the new style bracket.
I also still think some of the late year 98 Imprezas/Foresters may well have the new style caliper/bracket too.