You can only use T-IV in your boxes (or its equivalent, which there are some available).
Your boxes were designed for T-II (apart from the n/a which i belive uses dexII), yet T-II was superceeded by T-IV, its basically the same stuff but with a different name... the only difference being that the new T-IV (brought out in may last year) is compatible with both dexII and t-II boxes and fluids, however that doesnt apply to the mkiv box as it uses t-II anyway.
SO !! Dont bung anything else in, use T-IV... you'll all be glad tohear they've recently revised it yet again and the price has gone up to £63 for four litres , meaning that for a complete flush youre looking at £250
Like i say, there are alternatives to T-IV which match or exceed its properties.. one i think made by amsoil? not sure.