I need square nuts that go on the inner fender that bolts the inner to the core support. Anyone have a source?? Thanks Larry J

Those things are a welded in nut.....you're going to have to improvise...

I lot if not most of the Amercian cars of the era used them. You should be able to source some from just about any car just make sure you get the same. Another option is to make them from some flat bar, drill your holes and tap them, space them correctly and cut em off, instant square nuts!

It's called a pierce nut
You can get them , here
http://amkproducts.com/bulk3.asp?part=B%2D10558

Thanks JohnRR !!!! Larry J

My bad Thanks GTX6970!!!!!!!!!!!!!!!!!!!!