I usually make myself little notes like this one while working on something that requires close measurement and patience.
I measured the windshield opening from lower flange to upper flange at the locations of the wiper blade holes.
In both circumstances, 25 1/8 inches was the opening size.
When the roof is welded on, it has to have exactly the same opening size at the locations we measured at.
In the note above, it also says to put reference marks on both window frames in the same place, in the middle of the radius curve.
