Best Upper a arms for 72 a body

Roger, sounds good, ive emailed dr. Diff but no response. I just want to make sure it all works and that, that soecific brake kit is the 73 and up spindles. The summit site says large balljoints for the 52301 part number.

The 11.75” disk brakes are stock Mopar parts from the later B/R body cars. I run a set on my Challenger that I sourced from donor cars. While I haven’t purchased the kit from DoctorDiff, those rotors only work with the large ball joint spindles.