Found some more photos: (looks like the Dana cars had a different bar for sure)

B-Body 72-4 Rear Sway Bar.jpgB-Body 72-4 Rear Sway Bar 2.jpegB-Body 72-4 Rear Sway Bar Plates.jpegB-Body 72-4 Rear Sway Bar Dana.jpg

No Man With A Good Car Needs To Be Justified