Ok here is the first gen T/G racing 1969 Pontiac Firebird T/A rear sway bar. Not as intricate as the Chevrolet part, as it was a race only part.
It is 3/4" solid bar and is attached to a pre-welded base with two aluminum blocks. The width of the bar is 30" and there is 6 positions each side for fine tuning.
The adjustment points range from 4" leverage to 10.5" .
There are two Heim jointed links that attach to the leaf spring lower plate. The other factor to be considered with any bar is that the lever part is 90 degrees to the direction of the force, or the road surface to put it simply.
The aluminum blocks are both numbered, 13 and 14 in the case of this bar, and the attaching bolts are drilled head "Supertanium' items, and another brand marked L9, maybe someone can identify them. The two halves of the mounting blocks are located with a roll pin.