rs2000 brakes are a straight fit although only 20mm bigger than standard. Focus ST170 front calipers fit if you drill the mounting holes out from 10mm to 12mm. They won't need spacers although I think you will need need new flexi's. I think someone also said any mondeo mk3 caliper with st170 discs works without spacers and are obviously easier and cheaper to come by than ST170 calipers.