sliding glass door lock

Hello there. This is an interesting mortise lock. The body looks like our 82-218, but it has an extra faceplate around it. The faceplate reminds me of our 82-229, but this replacement does not have that extra 'sheath' that goes around the lock body like your old lock seems to have--see the images below for comparison. I'm assuming that extra sheath helps keep the mortise lock in place within the door. Therefore I think your best bet would be to use the 82-218 and see if you can reuse your old faceplate. Let me know what you think.

Alternate image for 82-229

Alternate view of 82-229

Opposite side view 82-218

Profile view of 82-218