About the first question, the part damaged is made out of rubber, is called a vibration damper, it dampens vibration back to the tranny and engine.
To replace it is just a matter to the get a new one, undo the bolts and put the other one in, keeping in mind that there is an arronw on the side of it that must point toward the front of the car. Look at bavauto.com for the part. And i am not sure if its called vibration damper.
And about the radiator leak, that plastic screw is the coolant air bleed screww, this is very you take the air out the coolant system. My advice to you, just get a net one at the same website, and simple replace it when the engine is cold, you dont want hot water sprayed onto your face. Keep in mind that where the screw screw into can also be damaged, so replacing the screw will not be the final solution, you might have to replace the coolant canister..
Anyway hopt it helps, let us know.
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