X2 ^^This is the way I see it.^^
Only exception is if you plan on swapping the K for a 73/ later spool mount K, which needs the different tabs and a different bar setup. But you mentioned aftermarket bar? Then you'd want your old LCAs I'd guess. That is you can run either early or late bar with a 73 K, if you have the early LCAs and fab (simple) bar mounts onto the bottom of the K.