73LCA on 72 kframe

On 67-72 the swaybar is mounted in front of the K frame. 73-76 the swaybar goes through the center of the K frame. Not sure how you can make that work with the 67-72 K frame.

Get a swaybar kit for 67-72 K frame that comes with end link brackets you bolt on to the LCAs, and cut off the 73-76 LCA sway bar brackets.

That's what I would do. Additionally, if your 72 LCAs have sway bar brackets, maybe you can cut them off and relocate them to the 73 arms. The only difference between 62-72 and 73-76 LCAs is the location of the swaybar endlink brackets.