Are the external bezels in any way available for an early 40mm Diver (Diver auto, Enicar in Saturn logo, old hands with the "snake" seconds)? Thinking of one with a couple of issues and the bezel would be the most serious one I'm guessing.
In this case it could be impossible to find. It's a very early one, without the red ring. That means it has a special bezel, that is a bit wider than the one with the red ring to fill the gap to the crystal.