ok to sum this up, please correct me if I´m wrong:
on the front axle I use Mondeo mk3 calipers with the stock carrier but i have to drill new holes with a larger diameter. With pads for the mondeo caliper and discs from a st170(300mm 4x108).
on the rear axle i also use the stock carrier with new, larger mounting holes for the stock fiesta st caliper to fit the 280mm disc from a st170? Here i use can use the same pads as with the smaller, stock fiesta st disc.
Is this correct?