There is a 78 Concord, 258, Auto at Victory Auto Wreckers in Bensenville, Illinois. Car looked like it was on the road a few days before being junked, odometer said 71,000. Interior was almost perfect with a tan interior (darker tan). Many nice items, including an intact hood release, perfect sun visors, seats looked brand new. Had a cool AMC wheel, and one AMC mudflap on the front. Car looked nicer in the person, as the sunlight ruined some of the pics I took. I would be willing to grab and ship small items that people are interested in for cost of item+shipping as I am in the area until March 12.
There was also a blue 75 gremlin, but I didn't take any pictures, some basic items left, but really rough shape, There are pictures listed of both cars on Victory's website under inventory.