What Idler Arm is this?!

Does your k-member have the spool type or biscuit type engine mounts ?
The idler arm in the last pic looks Identical to My 72 model so one thought is you may have a 73 + spool mount V8 K-member ?
Just looked at your pick again and I suspect you do have the 73 + K-member as The centerlink mounts below the idler arm for improved clearance .the 72 - mounts the centerlink above the idler arm . Notice the direction the mounting bolt for the centerlink is pointing on the two different Idler arms .