As for the joints at the ends of the links, get the best you can afford. The links will last longer and be stronger if you spend the extra dimes, plus if they fail it can be tragic. Everything from Johnny Joints to Heims are applicable. Many Companies like Poly Performance and Avalanche Engineering can supply you with these joints and the proper weld-in bungs to screw them into the links. And remember that the mounting bolts should be as close to perpendicular to the link as possible when installed at ride height to get the maximum strength from the joints.