I've seen 2 different styles of factory blow-out clips. The clip on the channel in my photos above is from a Camaro, maybe 80-81. I pulled them from a Camaro at the junkyard so don't remember exactly. But I have an 81 Firebird with the same ones. So, based on that observation, the factory may have come out with this style clip in 80-81. The black plastic on it is molded over the spring metal. The plastic is pretty thickly molded on there, so it seems to hold up much better than the other type.
The other type is what is on all 4 of my 79 TA's. Below are photos of one. Looks like spring metal that's been folded over itself a couple times, and dipped in black. But the black didn't hold up, so they rusted.
Interestingly, none of the clips in Ben's link to the clip pictures look like either of my original clips. I bought some of the "ebay clips" like in the link, from S&S classic on eBay I believe, but I haven't used them, since they look too different from original.
