Went and picked up the caliper brackets today, pleased with how they have came out
We used alfa 164 twin spark disks as there slightly larger at 257mm in diameter same as the gt i think, the only problem was that the inside diameter of the disk fouled against the hub so both were machined slightly.
Our wooden mock up that we gave to the engineer as a rough template
The brackets
Caliper bolted to the hub
Looking forward to bolting these on the car and getting the wheels back on, will be able to crack on with the rest then.