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I have now learned that "extruded u nut" is the proper name for some of the silliest hardware that GM has made. These are the style of connectors used on the OEM coolers, among other things. I can't wait to replace them with nylon lock nuts and new bolts.These two are similar, but might have something?
Cruise around on their websites a bit and they have a lot of other things - links above are my best guess to what you might be looking for...