Go to Rockauto online and let your mind be boggled by the HUGE selection of offset upper BJ bushings; a testament to the lousy idea of using bj's instead of kingpins. You need to know exactly how much each side needs bushed before you order them. Even the best Hunter machine is sometimes slightly wrong about how much offset is required to get the steering in specs, so you are better off letting a trusted and competent shop do the job right.
One local alignment shop wanted $300 to install offset bushings in mine after everything was replaced with new Moog components and said an alignment could not be done without first installing the bushings. So I let my friend and neighbor take my truck to one of the two shops he owns in a different city and he put it on his state-of-the-art new Hunter machine. I also gave him the very specific specs i wanted the truck set to. He was going to install whatever bushings it needed and was grateful for fresh, clean, parts and no rust and crud to deal with.
However, it turned out my truck did not absolutely need offset bushings. He was able to do a full alignment, including checking my rear axle alignment, and get very close to the specs i wanted, without installing bushings. The truck drives very nice, but I still have a slight vibration coming from one wheel/tire/brake drum, which is not a steering issue.
Since the front brakes are new with freshly turned rotors, and since the pulsing vibration is affected when I apply the brakes, I'm thinking I have some out-of-round issues with my rear drum(s). I'll keep after it until i find and solve the vibration.