[78w72]

Good point on having a thin flange, many have a thicker flange that would interfere with the bracket but probably not enough to cause an issue since the rubber/poly bushing is compressed before the bracket touched the frame.

Heres a pic of the fastenal rivnuts or "nutserts" as some call them, they have a very thin flange & serrations to grab the hole when inserted & compressed, also coated with a gold colored finish to prevent corrosion. They were about .50ea when i bought them a couple years ago. 3/8-16 thread to match the original bolts.

I bought these for my 81 T/A that only had threads tapped in the frame in case they strip out.