2wd discs were 273mmx10mm
Callipers were the same as every other Sierra/Granada
4wd were 273mmx20mm and vented
The callipers and carriers were specific to the 4wd cosworth, Granada cosworth and Granada estate
If you have a cosworth 2wd you can directly replace the rear brakes with the 4wd versions with just callipers and disc's, the hubs are the same as it's the callipers lugs that were different to the non cosworth versions