Sliding glass door handle and lock mechanism
Thanks for posting. This handle set looks like our 82-078. Unfortunately, we do not carry the locking mechanism used with this handle set, and I am not sure if it's available anywhere any longer. I apologize for this inconvenience.
We unfortunately do not. The mortise and keeper were discontinued some years ago, and due to their unique design we don't sell anything that would work in the same capacity.
The only thing we have that might still install on your door is a surface-mount handle set like our 82-005. This has its own mortise latch built into the handle itself, so it's not reliant on any mechanism inside the door. The only catch is that you'd have to drill new holes for it to install on your door, and likely for the keeper it comes with, too.