Have now managed to aquire a set of Brembo discs off a 748RS, not sure quite what the material is, but probably some kind of cast stainless.
Apart from modifying the brake caliper mountings to take the 5mm wider offset, was wondering if anyone could advise as to the best type of pads for use with them? I have monoblock calipers. will probably run bendix again, but all advice gratefully accepted.