I want to upgrade the rear brakes on my escort combi van before i do any engine swaps, now i know roughly what parts are needed, the only problem is rear calipers and discs, ive been told i need rear calipers from a sierra cosworth, but only the 2wd ones will fit, do they have to be cossie calipers, or will normal sierra rear calipers do?

if someone could do me a complete list of parts needed then that would be a great help

cheers