[suicideneil]

Pin to pin is usually the normal way of measuring, check if Kershawdesigns.com can help- Dan is usually good to deal with. You do want to leave about 1mm at either end of the dogbone/ pin to allow for chassis flex without the dogbones binding up or bending. Once the CD is mounted you can use calipers to check the distance between the drive cups + the depth of the slots for the dogbone pins.