well i fitted my ats cups my pads and discs were half way worn so all i needed was a 3mm spacer and they fitted fine, with only a 3mm spacer i didnt notice any contact on the arch and it seemed fine, also my bbs ET38 fitted fine with pleanty of pad and disc but the cups are quite a tight design anyway with not much room for the caliper
Was that on similar Break set-up?
