My 70 Charger has a 68 or 69 rear housing. The 70 mounts the brake splitter in a different place. Question is do I order a 70 or 69 brake hose (from the body to the rear) or am I going to have to get some odd ball part???

First off, I will say I honestly don't know.
If it were me I would probably go with the body line
that matches up with the rear so it's bent right.
I think you best bet is to call whoever is going to
supply the line and ask them. They can overlay the
two and tell you exactly whats different.

the hard lines are in it's the hose that runs from the body to the rear splitter on the housing

I had an A body that was jacked up in the rear & I used a hose from a 1/2 ton pickup(with an 8&3/4), it was quite a bit longer than the regular ones.

I'm not sure bro it was to far back but I think early 70's(1/2 ton D100) that would have an 8&3/4.