Here's the problem. The angled nipple on the radiator that is attached to the hose that leads to the expansion tank is broken. Is there a way to completely replace the nipple. I'm not looking for quick fixes, but rather the replacement part.

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1995 E420 152k
1991 300D 2.5 348116 daily driver
1992 300E 2.6 196k-work in progress(head gasket)
2002 BMW 745Li 93k