went to motor factors and got these....found out they are actually 2.0 calipers and not st170 which dont help either...only cost £35 each thats probably why!! I suppose i need to get in touch with fordpartsuk

least the pads and the 300mm disks are the right ones and a snip at £43 for both

on a side note are there any other compatable caliper set ups that work with the 300mm disks? This is for a fiesta rs turbo btw