First of all you need these conversion brackets.
(ZOO MOTORSPORT) £80






And this is how they fit.Painted mine red.





But the problem was my 17inch wheels didn,t fit.They bolted back on ,but when the wheel was turned they caught the caliper.
You need to space them out about 10mm or fit COMPOMOTIVES.
TWINS of here uses the latter option.



Also i think you will need the FOCUS RS discs as well (324mm)

Total cost of conversion can be done for about £450,depending on you getting a good cheap secondhand pair of discs and brembo calipers.
They calipers go for about £250 on E-BAY.