Front end rebuild on 1967 Dart

Sorry I am no help, I don't know the difference in the LCA's. They all interchange 67-76 except for the tab issue on anti -roll bars

So far as the "K" I cannot see the idler arm mount so I cannot help you there, either

Here is some more:

67 K member is all by iteself because of the stud mount idler arm. That arm MUST be used, or the K modified to fit a 68/ later which uses a bolt all the way through

68--72 K member uses an "underslung" anti-roll bar and pillow engine mounts
72-later K members the anti roll bar goes INSIDE the K and they use "spool" mounts
Any year K can be used with any year other components with exceptions:
Upper arms must be for the appropriate spindles as drum brake and 4 piston disk use "small" tapers in the ball joints
The 73/ later disk brake spindles use "large" tapers in the ball joints.
Lower ball joints must fit spindles and are different for 73/ later disk brakes

Any year lower control arms can be used except for mounting tabs for anti-roll bars, which you can fabricate
Any year steering linkage can be used except "the four" must match each other

Steering / Pitman arm must of course fit the spines on the box. Pitman arm must match idler and steering link, the split is 67 if 67K, 68--72, and then 73/ later

Any year tie rods/ sleeves can be used as long as the inner/ outer/ sleeves all match