Door latch (Hertford)

I am trying to repair very old door & handle and can't find the right part anywhere. Would, by any chance anybody had spare or not needed Latch with the size's on the photos, please? The main trouble is the 45-46 mm one. It needs to be thick 16mm and spindle enttance 8mm thickness. I would be most greateful for any help. With best wishes thank you for reading.