Yes, they are different, BUT as long as the sway bar you use matches the LCAs you're fine. Most of the later k-members need the early mounting holes drilled out, but the location is there because most of them do have the holes punched in one half of the stamping. We have built four a-bodies with the late k-member and early sway bars. I haven't used a late bar yet. There's no trick to it....