any Sierra/Granada caliper caliper. If you choose to use a 4x4 Sierra cosworth or Granada Cosworth caliper, you will need to use the vented disc to match, but this is really unneccesary on a Mk3/4 conversion..

Most brackets are designed for cosworth size discs, but unless you are using huge front brakes, then the smaller non-cosworth discs give a better front-to-back brake balance, but you will need suitable brackets to mount the calipers 10mm further in.