Please educate me on fender extensions

1970 Dart Fiberglass extension with deep eyebrow chrome moldings
1971 Dart Potmetal extension with casted in studs and deep chrome eyebrow moldings
1972 Dart Potmetal with removable studs and SHORT chrome eyebrow moldings
Thanks. My car is an early 71 so I guess it got left over 70's on the driver side. All factory hardware and original color (or maybe it got hit on that side back in the day). The passenger side definitely got replaced with '72 I guess.