Martin,

Current known common set ups are....

Standard S1 240mm disc and single pots (unsure of rear drums)
Standard S2 260mm disc and single pots (unsure of rear drums but bigger than S1)
2wd Cossie discs on modified 4x4 calipers and spacing shims
2wd Cossie discs on 2wd cast iron (heavy) calipers (don't think these fit directly and have to be modified)
2wd Cossie discs and S2 calipers on brackets.

2wd Cossie discs are 283mm.

After that is anyones guess...bigger wheels and completely different set ups all together.