Thank you all for your quick and helpful responses:

Jon G - Thanks - I called that business and they don't carry this specific fitting with the ability to bolt it to the frame.

Thank you Marzach and others for confirming on your trucks.

Thanks AmtrakJoe, Truckernix and Achipmunk for that option. May be a dumb question - Any guidance on what you used to clean it?

In considering the re-use of the existing junction block - the current set up looks like it has a larger line for the run from the block to the Master. Smaller lines that run from the block to the front and rear.

When I ordered my lines, they told me they are all 3/16 but they won't tell me what the thread sizes are on the fittings. It seems to me the issue is less about the size of the line vs. the thread sizes on the line fittings. Is that a correct assumption?

Thanks again for all of your help.
Victor