Brake line fittings help needed please

[msg]

I visited 3 auto part stores today looking for help selecting the proper fittings for a 1/4 inch brake line that I will be flaring from a coil myself. No one at any of the stores knew how to help me. I was told each time to just go buy the pre fitted lines and call it a day. I was able to get the last part store to let me in the stock area where they had a rack of the lines with fittings and I tried out a few to see if the fittings would take to at least have an idea on the master cylinder I bought what fittings to get.

The master cylinder I bought is this one
https://www.rockauto.com/en/moreinfo...33&jsn=3&jsn=3

I see that the primary is 1/2 " and the secondary is 9/16" but the thread pitch I didnt know so I tried some out and I think the primary is 1/2" - 20 and the secondary looks to be 9/16" - 18.

I think this is right but wanted to check.

Here are pics of the primary