sliding door part attached It is the upper metal closure it does not move so door doe snot lock

At first glance, your part looks compatible with the 82-238 double hook mortise lock. However, in this case, it would be best to have you send us a couple of photos showing the complete mortise latch and handle that goes along with it to get a closer look. Measurements are also key, so please include that information as well. Thank you.