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I call them spring steel U nuts or clip on floating nuts. Not sure if that's the official name but it'll usually get you what you want if you ask for them.
there are 3 company's I know of that maybe a help to you 1 is DISCO fasteners they have a web site. and the other is Herbs fasteners in Rochester NY. also try restoration specialties and even a local NAPA store
Do yourself a huge favor and go to McMaster Karrs website, harder to find everything online but a quick look threw their caralog and you'll be amazed at the selection and prices. I bought all of my hardware including those j nuts, very good source.