Sway-A-Way Torsion Bars

I’ve googled these to death and can’t find anyone out there in A Body land that are using these!!! As you can tell by the link they range in quite a few 1” sizes all at the same cost. They say they’ve been in business since ‘67!

MOPAR "A" Body Torsion Bar Set, 1962-1975 - Sway-A-Way | Racing Technology