ESOF, ugh

Does anyone know where to purchase the metal nipple that screws onto the knuckle, and then hooks to the rubber vacuum line?

Mine are corroded down to nothing.

Thanks for the help

 

Found a fix at the local hardware store, it's brass, at least it won't rust.

Not an 11 or 12mm, but a 7/16. Think this part is the only SAE on the truck!

 

It is actually a pipe thread, but not metric. It is probably 1/8" or 1/4" pipe thread. Commonly available. Pipe thread is a tapered thread which when used with a thread sealant creates huge pressures in the threads to seal the connection.