Steering Linkage

Does anybody know if the earlier (67-72) steering linkage is different from the later (73-up) linkage? In particular the idler & pitman arms.

I changed the k-frame in my '73 Duster to one from a '71 Dart, and I've got issues with the steering linkage hitting the starter. I've shimmed the motor mounts to raise the motor up, but there's still some interferance. I was wondering if perhaps the older parts are a little longer and would drop the whole linkage down a bit.

Any clues?