If you have upgraded fronts and want a bigger rear disc.  Use an a32 maxima rear caliper pad carrier and a a32 maxima 278mm rear disc redrilled to 4*100 or us sentra spec v with brembos rear disc redrilled to 4*100.  Bend the heat shield lip or cut it off.  Reuse your stock caliper and done.  OEM big rear brake kit.  20mm larger