First, I recommend you use the factory antifreeze anticorrosion agent under the part # I already posted for you. You may also buy it from your local MB dealer. As for trans fluid, I believe the transmission comes with Dexron III. If I were going to do a complete change, I would replace it with Redline synthetic, but that's probably not what you're up to. If you're just topping off after the radaitor change, use whatever is already in the car.
If this happens to anyone while you are driving, and you need a temporary fix, here's some pictures to illustrate the repair I suggested in my last post to this thread:
It'll get you home...
"We drive into the future using only our rearview mirror."
- Marshall McLuhan -
Northern California Wine Country...
"Turbos whistle, grapes wine..."