Axle Vent

Does anyone know of a vent bolt that will hold the brass vee and is 7/16-14 thread?

I have a 9" Ford in my Duster and there is a solid bolt holding the vee on. So, of course, the axle is not vented. I haven't driven it enough for it to leak, but I want to "stay ahead of the curve".

Searching, I've found Ford (Dorman 924-263, has a fitting for a rubber hose) and Mopar (Inline Tube and Dr. Diff) vent bolts, but they're 7/16-20.
Mine is 14 threads. I can only guess someone changed the thread when they put the solid bolt in.

I really don't want to pull the axle out to weld, redrill and tap the hole.

I'm wondering, maybe I could drill a small hole in the bolt I have, weld a nipple to it and pit a rubber hose on it.

Hmmmm, maybe I could weld up the 20 thread vent bolt and retap that to 14? Nah, I doubt it.

Thinking out loud... and hoping there's a 7/16-14 available. :rolleyes: