Dart Sport fender cross reference
Thank you sir.. Now on to door swapability..
Already done that. The door skins are all the same for the 2 door, hardtop cars. Meaning, Dusters, Darts, Scamps, and no-post Valiants all use the same outer door skin 67 to 76. It gets LOTS more complicated when you include the internal parts. Generally, you want to stay in the ranges 67-69, 70-72, 73-76, but even for those years there are one year only doors when you consider the internal mechanisms, window hardware etc.
If you've got a '73 Swinger, you can swap doors from any of the 73-76 Darts if you use the entire door and window and all the internal hardware. '73 is a one year only window/hardware/mechanism year though. I'm not sure what would be involved in using '73 hardware in a '74-76 door. So, your best bet for doors is to swap the entire thing, including the window, hardware, and mechanisms. And make a note of that if you have to buy glass or window hardware.
There's a thread here with a bunch more info on the differences between Duster and Dart doors. You could in fact use a Dart door on a Duster, but it would be some work to move the mechanisms and a couple of internal door brackets.
Demon door?? Which others fit?