I have two slider doors (more than 40 years old). The handles and latches are worn and no longer working.
I am not sure what the make and manufacturer of the door and parts are but hopefully the pictures and the nomenclature that I found on the handle and latch will help identify a replacement:
Handle:
Canadian Patent 919213
Patented 1973
Pat No. 3596954
Latch:
Made in USA
0497