[Charlie A]

In 69 or 70, I bought a 57 Bel Air 2 door htp with a set of traction bars like that.
The mounts were welded to the axle and rear frame rails.
Square tube steel on bushings / bolts and washers hanging from mount to mount.
Noisy and rattling but when you dump the clutch, it pulled the rearend of the car down for weight transfer.
Guess they outlawed them for some reason.