Looking for the correct size for sliding door lock/latch

A quick learner from Batavia, IL says:
I ordered part #82-218 Mortise Lock, round face, 3-11/16". The part is unfortunately at fraction too big. I cannot fit it in the door opening. Also, while I was removing the old lock, it slipped into the door cavity and now is gone forever. So I'm without any lock at the moment. Is there a lock that is just a bit smaller? It looks like the distance between the two screw holes is 3 3/4". Please help!!
User submitted photos of patio door hardware.
Profile picture of Paul
Paul from SWISCO responded:
I think the 82-218 is still the right match, you just have to try to maneuver it in the hole. Check out the video below for some tips on how you can do this.
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)