Any guidance on my 1970 Duster plans

Managed to get a late spool style k-member cheap, but with no LCAs. I haven't checked how my sway bar attaches to my current ones as I haven't felt like rolling around in the snow. Why is it that the sway bar tabs make the LCAs year specific? If the ones I have are too early, and I have no reason to believe they aren't original, I guess I'll be looking for a new set once I see how the sway bar connects.

I've got some other projects I need to find a machine shop to make progress with, and I'll just take this k-member over with all that stuff and get it hot tanked.