ok – so I already have a complete set of these braces, but the long fender bars are NOS.  I was able to obtain another set which all of the pieces are used OEM which is what I will mount on the car keeping my NOS bars.  This is the first set I have: https://dougbratton.info/blog/2015/12/1973-camaro-rs-braces/

Here is the new set I just obtained – they were required on the 1973 RS Camaro due to stronger government rules: