HELP with brakes

[Teasley4]

New to this, so don't point out the ignorance. I am replacing rear differential lines and am running into a mess of options. The new rear wheel cylinders are 3/8" fittings and T-junction is 7/16" running a 3/16" line. I was wanting to separate the flexible line that has a pressed T-junction to a T that I can screw a line into. Do I run 7/16" or convert fittings to the same as the wheel cylinder 3/8"? The T- junction has a mounting hole in it and I am having a hard time finding something that works.
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