They are a pal nut. Or some call them speed nut. On that one you can reach down from the top and put them on. Should be stamped steel with a 3/8 i beleve.
That is the correct clip. The retaining nut should have a rubberized or tar-like bead in the recess for sealing out water, that will preserve the threads and keep the nut from loosening. That is what the moldings on my C/B are installed with. I had purchased a box of 100 of the clips and nuts from Auveco. You should be able to find them at NAPA or on eBay.
10 pcs 8-32 PAL nuts with neoprene sealer NORS GM GMC
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