Acorn Latch Question

I need to replace the acorn door latch on my sliding aluminum screen door. However, the threaded blind screw stud rivet is missing from the door. It must have fallen out. I am trying to determine which sized rivet to purchase, but I don't know what the screw specifications are for the latch. Can you please help me out? Do you also sell a compatible rivet? Attached are photos of the aluminum screen door and the existing latch minus the spring, which was lost by my tenant.
The door has two holes. The top hole does not have a bling screw insert. The bottom hole had an insert, but the must be stripped, because the latch screw does not catch when I try to screw it into the insert. I cannot see any identifying marks on the latch.

Please let me know if you need additional information.

Thank you,
Jim