Metal dash frames

The standard gauge frames are pretty much the same for 70-76 Duster and 72-76 Dart. Frames with the wood grain panels will have holes for such. Main difference is the heater control. 73-up is different than 72-older.
71-older Dart are different.
Rallye frames are a different animal all together.
Post a pic of yours and I can see if I have one.