Hi Ollie, Unfortunately the guy that made the hats for me is nowhere to be found, I think he has moved overseas after the earthquakes, I needed to get a set of rear brakes done for another guy keen on a set, Otherwise I might have been able to find out for you.
We redrilled the holes for the rear ones, And yes it does get within a mill or two to the old holes, We put a loctite a Grub Screw in the old holes to help with the strength of it.
One piece of advice when making hats for the front, Make sure there are fairly shallow dished, The first set I got made looked like they would clear easily....But when the front suspension comes up the lower king pins rub on the rotor.
What size are the Michelin's?