Hard to reach rust quarter panel

Hello, Ken. Welcome to the site. Before we can help you, we need some more information. You are new to the site, so let me school you a bit. You ask if Charger body panels will fit on a 74 A Body. There are a lot of guys on this site who are really good with body work, but we need to know things like what model of charger (older 2 doors or modern 4 doors), which panels on your car need to be repaired and do you want to maintain a stock appearance or do some customization. If you are looking to maintain a stock appearance, I doubt there will be much from any Charger that will properly fit your Dart. That being said, you can use used panels from a dissimilar car as a patch panel if the crown (curvature) of the metal matches what you are working on. Please post some pictures of what needs to be repaired and we can more intelligently chime in. Plus, you can always post a parts request in our 'Wanted' section. You might just get exactly what you want.