68 Hemi Dart quarter panels...

[LO23M8B]

I suppose this is one of the early builds.
Well known car. Went on auction a couple years ago...
View attachment 1716427730

That doesn't look anything like mine did. But I think mine was a latter build.

 

[MOPARMAGA]

You mention a 48" rear end width, is that to rotor hat or drum surface where the back of the rear wheel sits flush?

I'll need to go check that for you & get back to you in about an hour