M104 coolant leak

[speednjay]

94 w124 developed a large coolant leak on the rear of the engine. I can’t see where but I think it’s the o ring on the driver side. It’s mostly visible on the pass side dripping down the bellhousing behind the exhaust. Would that o ring cause water to come out on the pass side or would it stay on the driver side? Any other coolant lines back there? Otherwise I guess I need a new head gasket.