Track bar differences?

[joey8383]

Swapping my 6 lug 69 6 lug manual brake rear end to this one off of my 72 power brake 5 lug rear. The black one is off the 72 rear end. Rusty one is off of the original 69 6 lug rear end. They're very different but looking at the rear ends, the mounts are same. You can see the sweep is very different and the rusty original 69 one sits a couple inches higher in the middle the way they're sitting in this pic. The black one seems to push the rear end over to the drivers side pretty hard. Any help or info? Thanks--- Joey