'82 - '88 Thunderbird power steering rack question

hope someone on here might have the answer to this. I have a power rack in my American Iron Javelin and it's leaking from the center fitting (see pic). I want to remove the two hard lines and replace with braided line like this flaming river road race rack uses (see pic). does anybody know what size fitting(s) I would need to switch to braided lines on the Thunderbird rack? it looks like the Flaming River rack is using a banjo bolt. would I use -3 or -4 (or bigger) lines? any help appreciated.

Stock rack

Flaming River rack

I don't know for sure but that fitting may be leaking due to the "O" ring going bad, Did you remove the fitting? There's usually O rings used at these fittings to make a seal. Replace the o ring and your're good to go;.