Looked up MC1 in AIM. AIM MC1 A1 under item part #4 6477216 Speedo Cable. The notation states, "installs same as RPO M20 with RPO L34,L35,L48,L78,& LM1". A new one on me, but according to that, the cable does indeed come out the hole you show. I told you this would be a fascinating study, probably not too many around, my guess.