(following up) I was able to finish up the install successfully. I picked up a 24mm socket to back out the rear upper control arm bolt. This allowed me to get the clip+nut out and gave me just enough room to get my smallest ratchet into the box to anchor/tighten. while I am happy with the new...
I'm in the process of installing the Belltech and it's not going well. I definitely wish I got the Hellwig. The Belltech not using the same forward mountain positions is a pretty big disadvantage and the Belltech installation instructions are pretty bad.
Details of my struggle here...
I was trying to install the Belltech rear sway bar and was successful getting 3 of 4 positions connected but not the driver side forward position. My frame is boxed and not open like the left image from the Belltech instructions (pic 2). I was able to drop the flanged nut in the boxed section...