1963 Dart brake line

Looking for information on the size of the front crossover brake line for a 1963 Dart. That or where I can get a replacement without buying an entire kit.

I went to bleed the brakes last night only to find that one plugged. I bled the rear brakes no problem with only a tiny bit of dirt, no rust. Did the drivers tire no problem, not even a little dirt. Just nice clean fluid. Went to do the passenger side and only getting the tiniest amount of fluid. All rubber components as well as master and wheel cylinders are new. Loosened at the flex line and only got a dribble. Loosened at the distribution block and got a decent amount there. Only loosened about half a turn so I didn't expect a lot.

I tried bleeding a LOT on that wheel to be sure. Thought maybe faulty collapsed rubber line but I would've gotten a lot more when I loosened it there. Even confirmed by pressing the pedal and spinning the tires. All lock easily except that one. Doesn't do anything so no pressure going to that wheel .

Want to make as close to original as I can and get this done. This and to finish flushing the coolant passages is the only thing left to be one hundred percent mechanically complete.

If I've missed something feel free to let me know.

Thanks in advance