Your front sling eye with it's flat sides looks as if made originally for a typical German – Austrian sling swivel for 7/8" slings. These usually have 3 to 3 ½ mm = .12 - .14" screws holding them to the base. Your rear sling eye does not look German or Austrian at all. It looks exactly like a bunch of such sling eyes I once bought from Numrich. The Numrich catalog then said "old Remington sling eyes", iirc.