I'm running the mk3 mondeo caliper and st170 disc conversion. Bought some new discs last week and a new set of pads from a local motorfactors.
However, I'm not to happy with the pads, they are the dustiest brake pads I have ever witnessed. Gave the car a good clean, went for a 2mile drive and the wheels were a darker shade of silver when I arrived with a clear complete layer of brake dust on them.

So out of curiousty, what pads do people use?