Franck, there are plenty of photos available showing the starboard side of Erla-G-10s (won't say where to avoid self-promotion...
).
At any rate the same applied also the few K-4s made by Erla, and this follows pure logic: they had taken so much time and trouble to redesign the frontal part of their G-10s that it would have been sheer nonsense to use a different solution for the K-4... (and nonsense had little room in German brains!)