Check on rock auto for alignment bushings. They have a huge selection of various brands and I have a set of 6 position solid raybestos ones that key into the tabs on the arm. These carry some advantages to tweak it on the fly, more flexibility over the 2 pos slugs.
For the center pivot bushings I replaced mine proactively when I rebuilt my truck but the stock ones still seemed in usable condition with no rot or sleeve issues. I don't know if there's an easy way to inspect them on the truck without being unbolted.
For the center pivot bushings I replaced mine proactively when I rebuilt my truck but the stock ones still seemed in usable condition with no rot or sleeve issues. I don't know if there's an easy way to inspect them on the truck without being unbolted.