[HO455]

I replaced my by buying copper-nickle tubing and bending my own. I wouldn't do it any other way. Like you my Burban is a bit bastardized. 71/72 front spindles and the rear axle is the same. Do a search for brake line woes. There's plenty of them out there. Why buy tubing your going to have to rebend?

If you run make your own hard lines you can then use the correct 1973 front hoses and run the new hard brake lines to where the 1973 brake lines went. The1967 hard lines end in a different location on the frame and you may have to do some real searching to get hoses that work.
I wish I had known this before I did mine. It would have been much easier to attach new brackets and run the tubing to them rather than searching for hoses to work. I did get some hoses to work but the arrangement of them could be better.

I don't know of any vendors that make hard line sets for vehicles with mix and matched components.

I have a local hydraulic hose shop that sells the copper-nickle tubing by the foot so I was able to match the factory tubing sizes and not have a bunch of left over tubing.
Hope this helps.