Handles and lock is missing 3" 7/8 mount

Thanks for posting! Your handle set looks similar to our 82-032, although, it is not an exact match. I am confident this will work as a suitable replacement for you. Look over the dimensions and see what you think.

Detail of outside handle 82-032

The compatible internal mortise lock is our part 82-218. Again, compare the dimensions to determine if this is the right fit for you.

Profile view of 82-218