Unless your current bushings are worn to the point that the axles are oblonged you're wasting your money IMHO. I'm not an expert by any means. Find a shop that works on big truck springs & axles and ask them. They do kingpins every day.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.