need help overflow nipple broke off my radiator!

[440racer66]

need help overflow nipple broke off my radiator. i was wondering if this is common problem and if theres any simple fixes. and oh if anyone has an 06 radiator pm me ill probably end up buying it

[Ncboost]

I have two radiators that have broke the same piece, Ive tried fixing it a few times and they end up leaking so i just bought another one on ebay.