I just discovered the rear gas tank strap screw is weird and apparently not reproduced. I'm not sure what models and years used them but definitely more than my 70 LeMans:
There are also lots of references to the 70 LeMans front valance in this thread.
I would add the radiator support. I understand there may not be much of a market but it surprised me when I found I could buy a repro for a 70 GTO but not for a LeMans.