Switched to a true dual snorkel from a later 126 560.
Still need to get the 2.25" fresh air tubing for the drivers side, and have to fix the passengers side snorkel. Am thinking I can push the plastic snorkel about one to two inches further into the aluminum housing, and trim to fit. That way I hope I can get fresh air tubing to that side past the rad overflow tank.
I will be moving the overflow tank back about one inch towards the wheel well, just about as far as it can go. MB managed to route a lot of wires where I need the tank to move.