The handbrake system on the new rear calipers isn't right as when fitting the handbrake cable it will come into conflict with the drive shaft, the donor rear handbrake system will solve this problem. So I have set about refurbishing them. Next door neighbour kindly put them into his shot blaster, thank you !!. Once prepped I dipped them into VHT enamel paint have left them to dry.
I also had to lower the holes for the coolant pipes as the front was not lower enough to allow them pass under the fuel tank, moving the holes down so they are about 5mm from the front box section give sufficient clearance for the fuel tank.