Another bit of advice - if you haven't bought a set of 4x4 calipers yet - don't.

Instead get a pair of the brackets from Mike R's ite, (most likely cheaper at £40 than a pair of calipers) and the S2 calipers, when used with 2WD discs gives about 5% more breaking power than the 4x4 calipers anyway (down to pad size/design)