Well I’ve returned from holiday keen and eager to make some progress. I have some nice new rear brake disks from Hi spec and so I crack on with a trial fitting. Unfortunately this was as much progress as I was going to make on the callipers. The Wilwood handbrake callipers with the actuation levers on the circumferential edge will simply not fit under the wheels. Aaaagh!
So the hi spec handbrake callipers it will have to be instead. These I’m assured by Hi Spec are dimensionally identical to my existing Ultralight 2 callipers so I trial fitted these up with the new disks. Eureka they seem to fit! Although the picture shows just how tight the clearances are.