Sorry to resurrect this thread, but looking to replace/upgrade discs and pads on my Williams... I was going to get the Brembo HC discs from the site Danny linked to above. Want to get the DS2500 pads, but not sure about the caliper thing - they say to fit lucas calipers, but not sure whether that's the standard Williams thing or what.. If anyone can point me to the right set of pads for the standard Williams, I'd be grateful!!