eBay ouch! $1000 for a pair of '66 Barracuda/Valiant NOS tail lights

Auction says "Will fit 1966 Plymouth Valiant, but will need proper lens inserts (not included)"

What are lens inserts?

The bottom 2 lenses are different, that's it, just need to install Cuda ones. I am really surprised the Valiant one didn't go higher, that was a deal on that one, bottom lenses are cheap, the Cuda reverse one is a little more. there was a NOS pair on eBay for $2500, and they were Valiant ones.