Here is a modern day one ,just not as beefy as the old one. scroll down to Aligning Weld Nuts
https://www.mcmaster.com/cage-nuts/If you don't have a welder these can be riveted it says. As you can see how it is made, that's why they put the piece of metal in its place inside holder,but the locking tabs still need to be there, for it to work.
