Finally all the parts have arrived. In the end I bought the Vitesse 1600 caliper mounting ring along with an up-rated front alloy hubs from Canley Classics. Amazingly the items fit together without too many major issues. The biggest problem so far is the alloy caliper bracket fowls the vented disk, however a couple of minutes with a junior hacksaw and a file I have managed to remove a small section of the bracket and now every thing fits together without any problems. I have also discovered a couple of other issue with the hubs that isn’t mention with the instructions that accompany the hubs. The first thing is you ideally need to use longer bolts to attach the brake discs to the hub. If this is done there will be less chance of you stripping/damaging the threads in the alloy hub. The other issues is the bolts that hold the steering arm in place have to be in a certain position or they will also catch the outside of the ally hub causing damage. There are still some outstanding issues that I need to complete such as modifying the dust shields so they can be used with the new calipers (I could leave them off but I want the car to look as original as possible). Once this is done I just need to paint all the parts and reassemble the front suspensions.