[Jeff Lee]

I think it matters what you have for a rear suspension. I tried un-spung pro-style bars on my leaf sping / cal-track Stocker and it flat would not work. I added springs to the housing end and it helped but not enough. Problems are the car moves on the bar. I'm sure these bars would work on a 4-link car.
I then added AJE bars and it worked very well and I was using them (same rear suspension) when I changed to a SS engine. I'll be using them on the ladder bars / coli-overs that are being installed.
I think a safe bet will always be the Cometition Engineering leaf-spring style wheelie bar. May not be the absolute trickest but always seems to get the job done.