My radiator was in decent shape but I broke that nipple off because I had the air filter box out and I leaned on the overflow hose. I had a teflon threaded fitting just the right diameter for the overflow hose to slide on. Just tapped a hole where the nipple broke off and screwed in the teflon fitting wrapped with 1 ˝ turns of teflon tape the plumbers use and it's not leaked since. Probably somewhere near 5 years now. Do a search. I remember member “icefire” did the same thing using a brass fitting I believe.

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1985 300D Turbo
"Evolution is God's way of giving upgrades" Francis Collins