You can also check here: row52.com to see if anybody has a Diplomat in a yard. It would be helpful to do some digging so you know what years/models interchange so you can widen your search. Also, it is commonly referred to as a "window regulator".
Thank you Kevin for tne welcoming! Thank you for the lead! Actually I might need come other body parts for my 1980 Dodge Diplomat woody wagon. Have a great weekend!