When you remove the lower control arm, they will slide right out of the K Frame (leave it attached to the lower control arm). Then remove the nut holding them to the lower control arm.
I cleaned up, painted and installed new bushings in my spare set of upper & lower control arms so when I was ready for them, it would be an easy install. Maybe Ulf (or someone in the Swedish Mopar community) might have a spare set you could rebuild. Lower control arms are the same 63-76 unless equipped with a sway bar in which case you would want 65-72's. Uppers are also the same except for the large ball joint 73-76 style. Maybe this will help!