I lost the tool to center the clutch discs for my car.
This is an openscad script to generate an arbitrary clutch alignment tool.
It worked great for my 92+ b series honda clutch.
You can either use the files provided for a 90-91 integra or 91- integra or change the scad file to make different shaped splines.
I have tested the stl for the 92 integra, I haven't tested the 91 integra one yet.