I have received correct 1954 1/2 ton brake lines and hoses from both Inline Tubes and from Classic Tubes. I have also received incorrect brake hoses from multiple vendors. Some times they specified the incorrect hose and some times they simply put the wrong hose in the right box.
The frame-attachment ends on the three flexible lines/hoses are the same size, even though the internal diameters of some of the hoses/lines are different. The frame attachment clip and the exterior diameter of those hose ends are the same size/diameter even if the interior diameter and end-fittings on the metal tubes/lines are different. There is no lock-nut used on the hose-to-line ends of these parts. The metal brake line screws into the hose end.
In this case, it seems the same vendor shipped a set of lines and hoses that do not match - it seems that the diameter of metal line male-end is a different diameter than the diameter on the female-end of the flexible line/hose. It seems that the vendor is saying they should work together.
I find it hard to believe that Inline Tube will not resolve this problem/mistake (if the description of the problem/mistake is what it appears to be).