IIRC Chrysler grudgingly sold those through dealers because NASCAR rules say anything run on their tracks at the time had to sell at least 500 to make it a "stock" car. Of course these were created for Richard Petty, thought they'd dominate the series when introduced. Sadly they didn't..........
Saw one or two on local streets, looked very out-of-place and oddly fascinating. Very cool today though!
There seems to be serious bidding on one of them--wonder what it would take for the seller to end the auction on both of them together?