68 K20 front brake help

[1968ChevyK20]

This may be a simple solution but my knowledge of brakes is little past the calipers and drums. What I have is a 68 Chevy pickup 3/4ton with original hard lines still installed across the front crossmember and the passenger side runs to a hole in the frame with an nipple to thread directly into the brake lines off the calipers. The drivers side is where I get hung up at that same location in the frame there is a two sided fitting with a hole in the middle. How do I attached the caliperblije to this? Or do I need to change that fitting into a T style fitting. See photos

Additional info if helps:

We did a Dana front and rear swap from a 73-87 application for disc brakes in the front drums in the rear. Unsure of the exact year but I have markings 44-8F under the pumpkin and C38335 at the top of the pumpkin. The BOM that's suppose to be on the axle shaft is not visible.

Thank you
Cody
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