What front brake hoses on a 72 to 73 disk brake conversion

Good point, I'll clarify.

Get all factory parts from a '73-'76 A-body, assemble it like the factory did, and be done with it.

It's not like there's some huge advantage to running the earlier sway bar, and five or ten years from now you're going to have to try to remember what parts you used if you do this mish mash stuff.

Yeah, just swap the entire K frame, replace the LCA's because the 67-72 sway bar tabs are in the wrong spot for the 73+ bar and buy a new sway bar instead of just buying longer hoses for the brake kit you already have. That makes sense.