are different size. The flange on the Quaife is drilled for both 10 & 12mm which the older R200s used. The R200 in the Z32 uses 13mm bolts so I had to enlarge the holes. The Quaife case is hardened so drilling was out. I ended up using a stone in a die grinder to hog them out. Wasn't hard to do and ended up looking and fitting perfectly but it did take some time.
Would probably have used a Tomei or Nismo diff if I had known all this from the start but once I had the Quaife in hand I was determined to make it fit.