1971 Demon fender interchangability

Kern Dog said
The 1970 Dart fender interchanges with both a 71 Dart and a 71 Demon. The 1972 fenders use essentially the same stamping but the side marker lights were changed. Physically they will fit.

Also, if you're using the chrome trim on the extensions, I believe those are different, as far as how they attach and depth too, maybe.