I purchased the CP169 rear sway bar kid 2 years ago, and it has been great for my panel. The sway bars are fairly simple, and probably made by one or two companies. My friend at a local "resto shop" ordered mine for me and cost $186 and it came from CPP. I have no complaints but I didn't have to deal with any customer service over a problem.
The sway bar was for the 1/2 ton pickup but I used it on my 52 panel. Boy, it sure stopped the rolling!!