I used vs commo caliper which bolt onto the 180b struts and I then bought a set of new magna verada rotors (296mm) ,which then jarrad (oldskool) machined the inside rotor hole out to slide over the back of the 180b hub .next the 4 holes were drilled in the rotor to suit the hub

Then I chopped and welded the strut 75mm to suit a nissan pulsar (n10) strut insert , so its now 3 inch shorter than factory and will allow for heaps of travel with nigels car dumped on its bum !