It does complicate things, but it just means you can't use the stock 67-72 sway bars. There are other options, like the Hotchkis.
#5904 is a B/E body sway bar. I would definitely want to measure one before I tried it for that application.
I think the Hotchkis is the only one that will bolt up to the 73-76 LCA's on a 67-72 K frame.
Looking at where the Hellwig 55917 mounts, it appears that it put the end links outside the strut rod mounts still. The 73-76 sway bar tabs are on the inside of the strut rods, so the #55917 probably wouldn't work with the factory 73-76 tabs.