I found a thread on the toytec adjustable panhard bar yesterday, if you search for it, you can probably find it.
Anyways, from what I read, with the stock panhard bar mounts, the bar only needs to be adjusted something like 0.25" longer to recenter the axle. The panhard drop bracket, which relocates the mount down an inch, gets the panhard bar back to an angle that is close to stock, and also eliminates the need to lengthen the bar. So really, the only point of upgrading to an adjustable panhard bar is for the heim joints, which IMO is not worth the money.
Hope that helps.