Crossmember identification and brake line selection

[mccollum007]

So I'm getting ready to order hard lines for my 70 brake system and have a few questions. The front end was fitted with 73+ front end parts when I purchased it but what I haven't been able to figure out is if they swapped those onto the stock 70 crossmember or if they swapped the crossmember out as well. I'm assuming which crossmember it has will dictate whether I get 70 or 73 front lines? I've attached a few pictures of the front end before disassembly. Also to muddy the waters even more my rear axle is out of a 66 donor, for hard lines on the rear I'm assuming I'll use 66 lines and then a 70 intermediate line to connect the front and rear? I appreciate any help y'all can give!