1920'ish round Yale mortise cabinet lock?

Toadstool

I need to replace this lock because someone drilled it before I acquired the cabinet it is in. I have done the usual Internet searching without success. This may well be because I have no knowledge of locks and am using incorrect terminology in my searches. Any help that can be provided would be greatly appreciated.

Thanks,
…Dave

Tom Gordon

Is there just the one bolt into the back to fix the cylinder?

Toadstool

I don’t know what is holding the cylinder in place. There are two small acrews that go into and retain the tang onto the rear of the cylinder. Is that what you’re asking about"? I apologize for not knowing the terminology.

Tom Gordon

I thought that I could see a hole (perhaps tapped) in the back of it.