The part on the left is some sort of vent. I asumed it was just a cabin vent. But Tony may be correct that its an AC drain tube.

You have 2 of those. One on each side and there is a right and left part. One is right next to the battery compartment the other is next to the brake booster behind the oil canister.

__________________
'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.