Outside height of bobbin sandwich 9.25 mm
Inside height of bobbin sandwich: 7.7 mm (Quite sure this does not matter)
Thickness of sandwich pieces: .6mm (Quite sure this does not matter)
Outer diameter: 21.5 mm
Interior diameter: 6mm
Wow, I measured with a by-eye caliper rule and I am within .05mm of things adding up in the sandwich part of things. I am a wizard. ;-)
Best of luck.