Either way is possible John, I can only speak for the perentie conversion which I have done a couple of times. A bonus is that with a perentie you don't have to change the MC or booster if you add discs to the rear (with the PBR setup already there). It is an effective rear brake with 4 pot calipers like the front and a much larger pad than any of the defender or rangie rear brake calipers I have seen.

