Replacement door lock cylynder

A home owner from Falls Church, VA says:
My door locks (2) are missing the cylinder you twist to engage the lock. The mechanism is still there and the door still locks but the cylinder you twist is missing. What parts or these?
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Dave Sr. from SWISCO responded:

We do carry two key cylinders similar to yours. See our 40-123 and the off-set 40-129. Remove your cylinder from the handle set and see if either match up to yours. 

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