Where am I measuring the door to determine the size?

A handy person from Chicago says:
I'm looking to replace a keyed sliding door lock and the 82-074 or 073 seem like the best bet. I'm so happy I found your site, now I just need to make sure I'm getting the measurement right to figure out which model to go with.
User submitted a photo of a mortise lock.
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Tom from SWISCO responded:
I agree, the 82-073 and 82-074 look like the best matches. The difference between them is what kind of door thickness they can accommodate. The 82-073 is meant for 1-3/8" thick doors while the 82-074 is meant for 1-5/8" thick doors.
A handy person from Chicago says:
Just wanted to say thanks for confirming; I went with the 073 and installed it this weekend. I appreciate the confirmation on the right part and the quick ship. It was super simple to change out and it's a big relief to have it done. I told everyone in our building about it.
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