QA1 sway bars complete the suspension upgrade for the front of 67-72 A-body, 66-72 B-body and 70-74 E-body Mopars. For use with QA1's K-members and control arms, these sway bars are made using 1 // hollow 4130 chromoly steel with a 3/16'' wall and are designed to improve performance and handling. These directly bolt on to QA1's K-members and lower control arms and are not designed to work with factory K-member.