mopars are still out in the weeds!

Mattsmopar, do any of these cars have solid rear halves? I'm looking to get a parts car, prefer 70-71 Duster/Demon for the rear 1/4 and part of the lower rocker at the rear of the door. When I get around to re-restoring my Demon I want to use a factory 1/4 instead of the aftermarket one that's on the left side now. Those cars look pretty good. Where do you live? Are they for sale?
This is an example of one I'm curious about.
http://www.forabodiesonly.com/mopar/attachment.php?attachmentid=46400&stc=1&d=1225597192