No I have not upgraded to the C-body tie rods yet. In fact the only NOS part that I have so far through a friend is the pitman arm.
My friend Special K, is good at tracking down all NOS parts if they are out there because he knows all the part numbers and lets me know.
I give you credit for tracking down NOS parts for a 73 sedan. You may actually have better luck than most since I am sure many parts are the same 73-79, and the number of people looking for that year range is lower than the 68-72s.
Since you seem to be committed to NOS, you may want to have your friend locate a set of cast iron K-member biscuits (4419942). These were used on 80s police cars and taxis. They will work on a 73 if you reverse them.
