Yeah. From factory they only had front lower cam bolts. But some people changed rear upper on axle end to correct pinion angle after a lift. Which most people found to be troublesome, they would move and get out of alignment. So people started eliminating them, getting adjustable arms to fix pinion and weld cam bolts in place or some new plates/washers or new axle brackets.
I don't have a welder so I'm hoping to find a bolt in option like those kits. And probably them welded in place for added security some day. I am gonna fix my pinion with the long arms and don't want cam bolts sliding on me. So that link posted above looks like exactly what I need. Thank you.