A body lower control arm shaft kit.

That probably won't be an issue. I have not used those poly bushings, though. The torsion bars are a bit shorter than the overall distance that they fit into.
I used your video on the rebuild. My "bumper plates" were held in place with four, stout spot welds. Drilled out one side, did the squeeze job and welded up the entire side of the plate. Installing the stiffing plates are a great addition. I do all of my welding with oxyacetylene. Really appreciate your videos.
Norm