Normalized MNI or Talaraich coordinates for modified Brodmann areas


I would like to use the Allen Brain Atlas - MRI Donor Data - Human Brain - MRI to find the normalized MNI or Talaraich coordinates of Modified Brodmann areas. In particular, subregions of Brodmann Area 40. When I use this tool, the MNI coordinates change but the corresponding modified BA region is not displayed. Any suggestions?