Front suspension interchanges

The calipers look like OEM so the lower calipers should be 1973 up.

To use the 72 back sway bar the 73 up spindles and calipers have to be switched side to side from the OEM position.

Not sure what you meant by lower calipers. Did you mean the LCA's. How do I determine if I have the larger ball joint UCA's.

That is good to know about the spindles. That will move the Caliper to the rear instead of the front correct? Is that going to be a issue then with my steering linkages?