Yes. . . Another Disk Brake Conversion Question

[michael bustamante]

ok now that rear end has been lowered and bagged (yay!) I started ripping apart my front end to install some 72 disk brake assemblies, (upper and lower control arms with zirk fittings and new bushing and ball joints) ok now I knowI gotta swap out some brake lines but which ones? the rubber ones only or the hard line from the "t" next to the driver side assy or all the way to the prop valve? (which is getting swapped out as well. Disk /drum.
Also I know tie rod ends and sleeves need to be swapped with 73-87 swap but what about in my situation? (1972 disk brakes)
One other thing 73 up lower control arms. . . are they wider? or or the heavy half lca`s wider? The reason Im asking is I was given a set of these and I dont know for sure why the lower control arms are so much wider where they bolt to the crossmember. Should I use these instead?