Thank you Paul and Tim,
Had a look at it again last night and I recon I will change to a Subaru disc which will put the disc in another 12mm and if I machine the hub I should be able to safely machine another 5mm off it which at that point I will be getting close to been able to fit four pot calipers.
Unless anyone else know of a brake disc which has a greater height than the Subaru which are 57mm unless I go for the rear ones which are 67mm high, but are only available in 20mm thickness
Or maybe I should look at some custom bells which probably be the easiest way !