Lock and key for a wood slider

A handy person from Baltimore, Md says:
Need new lock and key for wood slider. Inside with flu lock dimensions 3-3/4 x 1
User submitted photos of patio door hardware.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Looks like you have a very old lockset on your patio door. These exact parts aren't around anymore, but we may have possible substitutes. I've made a list of possible replacement hardware on the right side of this page for you to review.
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How to maintain a sliding glass door
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