How do you replace a window pane in a door
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Here is a sight that tells you how. http://homeguides.sfgate.com/replace-front-door-glass-insert-21467.html
https://glassdoctor.com/content/replacing-window-pane-in-door
It depends on the size. If it is odd shaped like an arc, make a template of it and take it to a glass company. When I broke our back door glass I measured the exact size of the rectangle and the company added on what was needed to hold it in the door slots, if that makes sense.
Need to know how the glass is held in, some are held by the trim around it and others are held in by other things (little metal inserts that go into the frame) and putty.