They're not really anything special. Adjustable control arms are a pretty straightforward deal. You can buy threaded, weld on inserts to put on DOM tubing and then just have one right-hand thread and one left-hand thread end to put on. They even make forged ends with poly or rubber to thread into the arms themselves. That's what I'm looking into currently, and depending on how it's done, you may be able to use the same arm with different ends, meaning you could run poly on the same arm as rubber or even solid. That's a big cost reduction in the end. This place sells the threaded tube inserts: http://www.barnes4wd.com/Tube-Inserts_c_16.html Here's what I'm talking about with the different ends. This place sells both solid and rubber threaded rod ends, so you could use either. Pics: Rubber rod end: Solid rod end: Link: http://www.rustysoffroad.com/builder-parts/threaded-forged-ends-inserts I just need to either find someone to weld the ends on the tube or finally pony up and buy a welder. Sadly, I never took any pictures after I cut the coil. The girlfriend was complaining about me being busy so I finished it as quick as I could and forgot to document it. Whoops lol. I'll have to pull the coil off to shim it anyways, so I'll get pics then.