When measuring your inkwell stand only one measurement is necessary. THE DIAMETER OF THE HOLE. This is called the BODY SIZE on my diagram.(See diagram below)
FLANGE SIZE & HEIGHT SIZE is not so important as these sizes are more or less standard and will fit 95% of all stands. However if you prefer you can watch my video and message me with all 3 sizes of you inkwell stand. I will then be able to give you advice on what size to go for .
(Please see photo Diagrams and Demonstration Video