Where to find 67 Cuda Well cover

Are you looking for a well liner such as this:
https://www.yearone.com/Catalog/Show?bid=24&sid=124&ssid=911&pgid=3093

Or, a top boot that covers the retracted roof:
https://www.yearone.com/Catalog/Show?bid=24&sid=124&ssid=433&pgid=3093
Other venders carry these items.