what mods are needed to bolt up a set of ford st brakes (off a fiesta st150, but same as focus st170 im told) to the front of a s2 rs turbo??

adaptor brackets needed?? or just spacer washers as with cossie calipers??

also, will b using 300mm discs as with the st170 set up, if that makes any difference. i have 17" wheels so thats not a problem

any info appreciated, dont want to buy the brakes until i know they gna fit