The rear bearing carriers on the non cosworth spec, disc brake Sierra are different, as the holes for the caliper to mount to are lower to compensate for the lesser diameter disc they used (calipers are the same as solid disc cosworth though)

The hub face if 4 stud is the same across the range of rear disc Sierra's inc cosworth, the stub shaft depends on whether you have 100mm driveshaft joints or 108mm driveshaft joints. 2wd cossie was 108mm, 4x4 and the rest of the sierra range if they had discs were 100mm

I have a pair of as new bearing carriers here from a 2 litre 4x4 sierra if of use. They are fitted with new bearing seats but no bearings. they all use the same Granada spec bearings.