top radiator connection
 

I have a 1990 mercedes 300e 3.0

While attempting to change the top radiator hose, I must have
applied to much pressure on the clamp. The plastic
spout on the radiator that the hose connects too broke off.
The part is attached to the side of the radiator.
Please tell me the name of this part and how to replace it.

You will have to replace the radiator.

Just click on PartsShop and call Phil in the morning. HE will send you out a new one pronto!!