Looks to be NOS.... https://chicago.craigslist.org/chc/pts/d/evergreen-park-1968-buick-wildcat/7285732234.html
Thanks for the lead. I agree-this may be the only one left, or it would probably be a very long time before another one would surface. I thought the price was reasonable, too-considering what people are asking for much smaller NOS parts these days.