Thank you for the information ... I am slow in responding because just got back from camping with Grandkids!
A nut rivet or similar type of blind insert must be what the nuts are ...
They do look similar to a rivet in that there is compressed material on both sides of the firewall. I will take a look at Harbor Freight since there is a store near me ... Yah I am cheap
If I don't find them there, I am sure I can get one at an industrial supply house since I now know what to ask for. Thanks again!