Hi I have measured mine it has 5.5” centre height. It seems going by the tool holder on some will mean the tooling will be to high and if I go with smaller the tool holder only go 12mm or 1/2” thanksOlder viceroys are 5" centre height and newer ones 5-1/2". The BXA/200 series toolpost is a good match for the later (normally camlock spindle) ones but I don't know about the earlier. They'll hold 16mm tools, just about.