the spring will still twist a little, he's looking for something like a bolt in panhard kit. I don't have experience with them, but people like david pozzi etc have said that it is something you want to be carefull with because if not done correctly it can easily cause bind in the rear suspension, specifically on leaf spring cars
If your tires are rubbing a little it is probably due to them cambering in a little, putting a panhard etc is not the correct solution to fixing the problem. Wheel size is. However if it was me I would start with the del-a-lums like suggested. that will get you in the right direction. I have them in my car. Using them in the front spring eye pocket does make the ride a little harsher but nothing huge. Also if you are running a rear sway bar you will probably want to ditch it if you go with the del-a-lums
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