Sliding door latching mechanism

Hi, Ron. Please take a look on the website at the 82-238 mortise latch. I believe this is the part you are looking for. If not, let me know what differs.

Sorry for not saying this before, but that's a great photo! Most of the time we're lucky to get a smartphone photo with a ruler thrown next to the part.

I didn't mention replacing the internal component (anti-slam button) because, while you could simply remove it, it would remove an important safety feature that prevents you from slamming the mortise into the jamb of your door. The part isn't available by itself. To maintain the normal function of the door, you'd have to replace the whole mortise.