I was directed to this thread and the only post worth viewing is the very first one so don't waste your time reading 19 pages.
Ridge Collar: Affordable/Effective Performance Upgrade
I installed mine today. You need a 1/2" drive 19mm 6 point high quality socket to remove the 4 bolts. A 1/2" breaker bar, 1/2" extension, and 1/2" ratchet are also needed. Just slide the bushings onto the bolts that you remove. The thick bushings go on the 2 front cradle bolts and the thin bushings go on the rear suspension cross member bolts. Look at the pics in the thread link to see which bolts to remove. If you find it difficult to install the bushing/bolt into the frame hole it's probably because the bolt and hole are off center. Loosen (not remove) any bolts that support the side your working on to allow the frame to center itself on the bushing. Only work on one bushing at a time so as not to allow the sub frame to fall down. I never jacked up any wheel to do this. It can be done on the ground. I put the rear end of the vehicle over a hole in the yard to access the rear bolts (also put on my Tuix rear sway bar while I was there).
I test drove the vehicle and I swear I can tell the suspension is squared up. My steering wheel just feels more centered and stable. I had to loosen my left front side to get the bushing in which probably squared up that side's geometry. As far as ride feel, changes in handling, & suspension motion I'm just going to have to drive it more for a full evaluation.
This should at least provide more information than what I got when I purchased these from Shark Racing which I still have not heard back from on this.