I modified the plastic ones to fit my 67 Dart. Done a long time ago, do not remember exactly what was done to modify, but I do remember it wasn't difficult.
Thanks for the replys and info. I any body has a set to sell let me know,and better yet a set i can pick up at Carlisle. Just pm the info. Part numbers are 3674306 right and 3674307 left as far as i know for 73/ 74/75. Thanks
The plastic one's for a later Dart/Dart Sport should work without modification. The ones for a Duster/Valiant/Scamp are different and won't fit without modification.