What fitting is this?

So I received a 9/16-18 fitting today in the mail. It's the same as the other fittings I have, so that's not it.

I ended up calling dorman and got ahold of a tech. They pulled a drawing and it showed 9/16-20. That a really oddball thread but apparently for a period starting in 73 Chrysler changed to the slightly finer pitched thread. I ordered a couple from summit today. There are very few to even choose from. I picked up both a wilwood branded and an Edelman branded one. Hopefully this works out. Really would like to button this side project up and at least get to drive my new car!

Edelmann 258303 Edelmann Brake Adapter Fittings | Summit Racing