For Bronica ERTSi Owners: Measurements of Ground Glass

Hey fellas!
For the Bronica ETR/ETRS/ETRSi Owners: What are the measurements of the actual ground glass?
Thanks!
cheers

Just the glass and not the frame as well ?

54.38mm X 45.68mm X approx 1.9mm . Ground glass only.
Thickness is approximate as I'm not prepared to strip it out of the frame.
As it sits on the four ground sections the part you focus on is in the same position regardless of if the thickness is fractionally out .