1965 Dodge Dart Charger

Several month ago I bought what I thought was the right wellnut. However I just found out that the threads are wrong. Does anyone know what thread size the wellnut the door and fender ornament should have on a 1965 Dart GT?

Thanks Dan and Keith for the information on the felt thing! I will send them an email so hopefully I have an answer soon.

Don't know if these pics will help you ULF but they are the ones used in my 65 Dart GT.