I got the reply from Thorlab the flange can't accept the thicker optical windows. So I think we have to make our own custom small flanges. I'll check TCS small windows design and make a drawing and consult with Steve again.

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Hi Tara,

Thank you very much for your response.  It looks like our flanges can only fit
windows 0.1 mm thicker, with a tolerance of +0.0/-0.2 mm, so these flanges would not
be cross-compatible with existing windows.  I apologize for any inconvenience this
may cause.  Please let me know if you have additional inquiries, as I am very happy
to help.
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