Like rears, Focus SVT front rotors are bolt-on with slightly larger diameter, unlike rears cannot convert with factory parts. Gold Coast does a kit to convert base Fiesta to 300mm, should be possible to do similar for ST. Was thinking of fabbing up a one-off set for my car but got to thinking there might be interest in the community. Not set up for production myself but thought I'd start a thread and if it looked like there was interest maybe could talk Gold Coast or Dpro or Ron into working something up.
http://goldcoastautomotive.com/cgi-bin/p/awtp-product.cgi?d=gold-coast-automotive&item=81601
http://goldcoastautomotive.com/cgi-bin/p/awtp-product.cgi?d=gold-coast-automotive&item=81601