The D-ring for the Graflex from ANH has been updated and is based on the recently discovered ‘Elstree saber’; a prototype made during ANH production which shows a double riveted, handmade clip with a D-ring. The clip is made from aluminum, the D-ring is nickel plated steel.
These are screen matched based on the known promotional pictures. Two screen accurate rivets (3 mm) are included.
See the updated blueprint with details here.
Loose D-rings can be found here.