I've seen those, I just cannot remember for sure who's they are...
The reason for the adjustable points on the arms was to allow the elimination of the front control rods and let them cycle more, thus more travel while still being able to do a proper alignment.
I just talked with someone at TC and out of sheer curiosity sent this link off so I can get a second opinion.
I figure this way we'll get you an answer somehow.
[EDIT] Early FabTech Ivan Dan or home fabbed deal? Shock tab's are different though..
Fab-Tech Ivan Dan

I knew it was some sort of thing related to 4WP.. get me a shot of your lower truss to be sure.