Yup. Those are actually torque-arms, or control arm braces.
There was an attempt to copy them here on this Forum, and it resulted in cracked lower control arms on a 92 SSEi.
I actually still have all the components for install, but don't want to risk cracking another control arm (one already is from Woodburn) until I figure out a way to dampen the rod a bit.
A little searching should uncover more info.
Keep in mind the link in that topic is for W-body. G and H bodies will be different brackets/dimensions, and would have to be custom.