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Hi Dries,
during my PhD I had good experience with the 24-well plates with glass bottom
from http://www.glass-bottom-dishes.com/ (no comercial interest).
If you want to have individual coverslips try http://www.knittel-glaeser.de/
(again no com. interest).
They will produce custom diameters if you want.
Regarding the diameter I found it better to use 12mm, giving you a bit of
space to lift the coverslip out of the well.
Best
Florian