Ready to start connecting up the various components of the brake system on my project and I think I am missing a part.

I had assumed that the brake line connected directly to the outlet of the master cylinder but the thread size on the brake line fitting is too small. (The brake lines were all replaced by a previous owner 30 years ago and not ever connected to a master cylinder.)

Looking at a diagram in the 1929-1950 MPC that I have, it shows an "outlet nut" that might be what I am missing. I am using a master cylinder with the casting #5450256 which shows up in the MPC in Group 4.650 as being for '38-'46 ALL 1/2 TON COMM.

In Group 4.652, it shows an outlet nut of part number 5450607 is being for '38-'50 ALL 1/2 TON COMM (and a gasket for the same).

I have attached a photo of the illustration in the MPC that has me thinking that it shows the part I am missing. I have also attached a few photos of what I am dealing with on my truck.

Please let me know if I am on the correct path or not. Also, if I am heading the correct direction, where might I find the part(s)? I have done a quick search using the part number from the MPC and came up empty handed.
Attachments
Missing Part Maybe.jpg (183.58 KB, 111 downloads)
IMG_1034.JPG (217.76 KB, 109 downloads)
IMG_1035.JPG (232.08 KB, 109 downloads)
IMG_1036.JPG (318.04 KB, 106 downloads)


Nick
1940 KC Model 1/2 Ton Pickup Project
(with '37-'39 Bed and what we think is a '42-'46 Frame)
Taos, New Mexico