Hi Spegg.,
It's pretty straight forward (There's 2 styles, yours should be the '66-'75 type) .....it slips over the orig. aft. you die-grind the tac-welds off the top bolt. I believe you can re-use that bolt in that same hole if it's long enough.
The old hole that held the track-bar gets a bolt. The lower hole is where the track-bar now mounts. I believe there's an anti-crush spacer that goes there as well.
Probably best to weld the new bracket in place, in a few spots, even though it's bolted.
Hope that's clear as mud....

:wacko: