They’re 2 pieces per side. That eBay seller has had those emblems listed since at least 2008, I bookmarked them all the way back when I bought my butterscotch GT. They typically sell for about $200 for a full set, as in, all 4 pieces. So they’re massively overpriced, and of course they’re only half of what you need.
They’re really hard to find, but, there also aren’t many people that need them.