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If you send me your email I'll send the pic direct.
From the NAGS chart...29 Tudor
Door 26 3/4 x 16 1/8
Quarter 30 9/16 x 16 1/8
The Back glass doesn't show a true size...they only give us the block size so consider making your glazier a pattern that fits the hole snuggly (with your U channel seal around it and the corners in place)
Corrogated cardboard from a good heavy box works OK.
related facts...
1) Dry corrogated cardboard will grow by exactly 1/8" over a 1 foot span along the flutes if placed outside for 30 minutes on a damp or foggy or humid day.
....an 8 foot piece will grow a full inch!
2) Block size = the size of a square cornered sheet required to make your window, taken up to the nearest even inch.