Dorman 626589
I used this part and just cut the excess pipe off and its running great!

 

Did you ever figure out the name to the tube nut? Or how did you get the broken “nipple” fixed?

 

I used a copper plumbing elbow to repair the one on my 460 about 12 years ago.

 

The Dorman part in the post before yours from two years ago comes with the nut. I don’t know if you can find the Motorcraft KT-81 or KT-84 but when I bought those parts three years ago they both came with the nut and thread sealant. All I had to do was screw it into the intake manifold.

What vehicle are you working on?