At first it seems that the angle cutting the calcite and the thickness are not the main factors, as much as the angle of the optical axis one of the two attached halves. So unlike Wollaston prisms, the distance to the interference plane seems to be the main issue. So measuring the distance from that interference plane to the "located at the (effective) objective rear focal plane" is the main calibration to match up to. How to run light through an objective and a prism to get those distances, I don't know right now. But it seems if you had those numbers, you could raise or lower another manufacturers prism mounts to match up to their objectives.