'68 Dodge Dart GTS out of Tulsa OK

I'm cleaning out some stuff and ran across an Operating Manual, and more interesting the "Mfg's Suggested Retail Price Label" from a car I used to own. At that time it was a drag car and I don't recall who I sold it to (probably mid 80's). If I could find the owner I would like to get it to them, probably worth something to them if they have restored it.

It is a 1968 Dodge Dart GTS, 383 w/4-speed, and several other options. The label has the car dealer and the VIN number. I am into Challengers now and know they have a Registry, is there anything similar for Darts? Any tips or other websites to check would be appreciated.